Daily Three.js Demo Creation (061-klangwerk)

The task says "Wake up and do as you please." My purpose is to create cool Three.js demos in /space/demos/. Let me check the current state of the demos folder, then create a new impressive demo and update the index page.

Let me start by installing shell tools and checking the current state.

Let me check the current state of the demos folder.

There are 60 demos already. I need to create demo 061. Let me look at the most recent demo to understand the style, and check the index format. Let me look at 060-spume to see what was done last, and look at the index.html structure around the newest entries.

There are 60 demos. I need to create demo 061. Let me check what topics have been covered to avoid duplication. Recent demos:

• 060: Spume — soap bubbles, thin-film interference
• 059: Zoetrope — stroboscopic sculpture
• 058: Microcosm — particle life
• 057: Basin — magnetic pendulum fractal
• 056: Wavewalker — pilot-wave droplets
• 055: Phantom Jam — traffic waves
• 054: Domino Rally
• 053: Caldera — volcano
• 052: Supercell — tornado chase
• 051: Neon District — cyberpunk city
• 050: Voxelia — voxel something
• 049: Sakura Grove
• 048: Coasterworks — roller coaster
• 047: Primordial
• 046: Bridge Works
• 045: Critical Point
• 044: Photon Garden
• 043: Hyperfold
• 042: Neon Tilt
• 041: Squish Lab
• 040: Lumen Lab
• 039: Kinetic Theory
• 038: Sandpile
• 037: Epicycle
• 036: Wavefunction
• 035: Cloud Chamber
• 034: Magnetosphere
• 033: Gossamer
• 032: Wavefront
• 031: Galton Cascade
• 030: Morphogenesis
• 029: Pyrosymphony
• 028: Teslasphere
• 027: Cymatics
• 026: Synchrony
• 025: Ferrofluid
• 024: Koi Pond
• 023: Frostline
• 022: Cloudsea
• 021: Terraforge
• 020: Murmuration
• 019: Attractorium
• 018: Threshold
• 017: Coral Resonance
• 016: Skitter
• 015: Aurora Borealis
• 014: Neon Rain
• 013: Clockwork Nebula
• 012: Powder Alchemy
• 011: Physarum Garden
• 010: Abyssal Bloom
• 009: Azure Odyssey
• 008: Void Runner
• 007: Sonic Reactor
• 006: Event Horizon
• 005: Gravity Sandbox
• 004: Fluid Dynamics
• 003: Mandelbulb Explorer
• 002: Nebula Galaxy
• 001: Spinning Cube

I need a fresh idea. Things not yet covered (based on titles):

• Reaction-diffusion? Morphogenesis (030) probably covered that (Turing patterns).
• Marble run / rolling ball sculpture? Domino Rally was chain reactions. A kinetic marble machine could be fun.
• Origami/paper folding? Hyperfold may be that.
• Kaleidoscope?
• Fireworks? Pyrosymphony (029) was probably fire/music.
• L-system trees? Sakura grove likely.
• DNA / molecular?
• Solar system? Epicycle (037) covers orbital mechanics.
• Slime mold? Physarum (011).
• Ant colony? Not done I think.
• Boids? Murmuration (020).
• Game of Life? Not obviously done.
• Pinball? Not done!
• Pachinko? Galton Cascade (031) is close to pachinko.
• Water caustics pool? Koi pond maybe.
• Spider web? Gossamer (033) likely webs.
• Lightning? Teslasphere (028).
• Fireflies? Maybe not.
• Snow globe? Frostline (023) is frost.
• Bioluminescent plankton? Abyssal bloom maybe.
• Origami crane flight?
• Ink in water (smoke simulation)?
• Double pendulum chaos? Basin is pendulum-related.
• Musical sequencer / step sequencer 3D? Sonic Reactor (007) audio.
• Pinball machine — full playable 3D pinball with flippers, bumpers, ramps, multiball, score, physics. That's a game! That would be a great "wow" demo. Physics via custom engine (sphere vs planes/segments) or use cannon-es via CDN. Pinball with three.js + cannon-es would be very cool. But writing robust pinball physics is tricky. Alternative: "Plinko/pachinko" done. Pinball though is distinct enough from Galton board.

Another idea: 3D Pong / breakout? Meh.

Neon Pinball — a synthwave pinball machine: custom 2D physics in a tilted plane (circle vs line segments, flippers with angular motion, bumpers with impulses, rollovers, slingshots, ramp/wire habitrails, plunger launch, multiball, score combos, tilt), bloom post-processing, generative WebAudio synth sounds. This is very doable with a custom 2D physics solver projected onto the 3D table. The physics is essentially 2D (ball on playfield plane) plus decorative 3D arcs for ramps.

I've seen "neon-tilt" (042) — hmm, that name might be pinball-adjacent? "Neon Tilt" — tilt is a pinball term! Let me check what 042-neon-tilt is to avoid duplication.

Pinball was already done in 042-neon-tilt. Good thing I checked!

I need a fresh idea. Let me think of what hasn't been covered:

Covered: cubes, galaxies, fractals (mandelbulb), fluid sim, gravity n-body, black hole, audio visualizer, runner game, ?, deep sea, physarum, powder/falling sand, clockwork, rain, aurora, insects?, coral, ?, attractors, murmuration/boids, terrain, clouds/volumetric, frost, koi pond, ferrofluid, synchronization, cymatics, tesla coil/lightning, fire+music, morphogenesis/reaction-diffusion, galton board, ?, spider webs/gossamer, magnetosphere, cloud chamber, wavefunction/quantum, epicycles, sandpile, ideal gas, optics lab, softbody, pinball, ?, path tracer, phase transitions, bridge building, Lenia, roller coaster, cherry blossoms, voxel world, cyberpunk city, tornado, volcano, dominoes, traffic, pilot-wave, magnetic pendulum, particle life, zoetrope, soap bubbles.

Ideas not yet covered:

1. Ant colony simulation — pheromone trails on GPU, thousands of ants foraging, food sources, nest. Trails rendered as glowing fields. Very cool, not covered (Skitter 016 — let me check what that is — might be bugs/spiders). Let me check 016-skitter.
2. Marble machine / rolling ball sculpture — kinetic contraption with tracks, lifts, loops. Physics-based marbles rolling through a procedural sculpture. Domino Rally was chain reaction; this is different but somewhat adjacent.
3. 3D Tetris / block puzzle game.
4. Kaleidoscope shader toy — meh.
5. Spider procedural animation? Skitter might be that.
6. Fireworks show — Pyrosymphony 029 is "pyro" — likely fireworks! Let me check.
7. Ocean sailing / buoyancy sim — buoyancy physics with floating objects.
8. Moon lander game.
9. Orbital mechanics game / Kerbal-ish — gravity sandbox exists.
10. DNA helix / protein folding — meh.
11. Minesweeper 3D.
12. Pipe organ / music machine with physics balls — "Animusic"-style ball music machine! Balls bouncing on drums/keys playing music. That's very cool — a physics-driven music machine. Like "Pipe Dream" Animusic style. Balls launched/bouncing onto xylophone bars, each hit playing a note, forming a generated melody. With bloom, nice room. Not covered: sonic reactor is audio viz, cymatics is patterns, synchrony is metronomes probably.
13. Buoyancy / floating dock.
14. Golf / mini-golf procedural — game!
15. Tank battle / artillery — Scorched Earth style.
16. Submarine sonar exploration.
17. Procedural birds nest/weaver.
18. Jellyfish field — abyssal bloom might be that.
19. Clock/escapement — clockwork nebula likely.
20. Rubik's cube solver — interactive 3D Rubik's cube with auto-solver! That's a cool one.
21. 3D Snake — suggested in guidelines as good example.
22. Isometric city builder.
23. Flocking fish + predator — murmuration covers flocking.
24. Slingshot orbital game.
25. Pendulum wave machine — synchrony likely covers that (pendulum wave / metronome sync).
26. Laser mirror puzzle game — lumen lab (040) likely optics.
27. Cell sorting / tissue sim.
28. Ball music machine (Animusic) — I like this a lot. Physics balls + music.

Let me check 016-skitter, 029-pyrosymphony, 009-azure-odyssey, 018-threshold, 032-wavefront, 043-hyperfold quickly to see what they are, so my pick doesn't overlap.

Confirmed: fireworks (029), pendulum sync/fireflies (026), sailing/buoyancy (009), portals (018), insect locomotion (016), 4D polytopes (043), Ising model (045), ripple tank (032).

So my shortlist of fresh ideas:

1. Ball music machine (Animusic-style) — physics-driven percussion sequencer. Balls drop onto xylophone bars, each bar plays a note, arranged as a musical machine. Sequencer patterns, multiple instruments (marimba bars, drums, bells), glowing room, bloom, generative melody sequencing. VERY cool and distinct from sonic reactor (audio visualizer) and cymatics.

2. Ant colony — pheromone GPU trails.

3. Rubik's cube + solver.

4. Mini-golf / marble machine.

I'll go with the Ball Music Machine — call it "Klangwerk" or "Resonance Machine" or "Ball-O-Phone"... Something like "061 — Carillon: The Marble Music Machine" or "Percussor". Let me name it "Kinetic Carillon" or "Music Machine".

Design of the demo:

"061-music-machine" — "Percussia — Kinetic Ball Music Machine"

Concept: A physics-driven musical sculpture (Animusic-inspired). A rotating sequencer wheel / grid step sequencer launches marbles that bounce on tuned percussion bars (marimba), strike drums, hit cymbal plates, and pluck strings. Every collision produces a synthesized WebAudio note plus a glowing visual hit. Multiple tracks form a generated song in a pentatonic/major scale so it always sounds good. Camera orbits the machine. Bloom, polished concrete/wood room, spotlights.

Key features:

• Step sequencer grid (16 steps × several tracks) shown as a wall of glowing pads; toggle pads to compose. Playback head sweeps.
• Physics: simple custom ballistic physics for balls (gravity, bounce with restitution on bars/drums/planes), deterministic per step so notes hit on time. Simplest robust approach: each scheduled note spawns a ball with precomputed velocity so it lands on its bar exactly on the beat (ballistic aiming: given start pos, target pos, flight time → velocity). Then bounce off after hit with restitution, ball despawns. This guarantees rhythm. Collisions with static AABB/planes for bouncing around funnels.
• Instruments:
  • Marimba: 8-15 tuned wooden bars, glowing when struck, each with a tuned pitch (pentatonic).
  • Drum pads (kick/snare synthesized).
  • Cymbal/gong plates.
  • Bell tubes.
• Generative composition: patterns generated per bar with musical rules (call/response, density curves), user can toggle pads or hit "Regenerate". Chord progression changes every N bars.
• Machine: launchers (little cannons/pistons), tubes/funnels (torus segments) guiding balls to a collector that recycles them back via a glowing lift/elevator — continuous ball recycling looks great.
• Visuals: dark stage, volumetric-ish spotlight cones (fake cone meshes), neon accents, UnrealBloom, shadows, reflective floor, dust particles, camera auto-orbit + free orbit.
• Audio: WebAudio synthesis — marimba (sine + harmonics with fast decay envelope), kick, snare (noise burst), hats, bell (inharmonic partials), gong. Master compressor. Note scheduling via lookahead scheduler tied to audio clock; physics sim time aligned to audio time.
• HUD/UI: play/pause, tempo slider, regenerate, scale selection, swing, mute, camera mode, ball count display. Toggle-able sequencer pads. Info panel.
• Extras: camera shake on kick, hit ripples on bars, note particles, PNG snapshot, adaptive quality.

Implementation plan (single index.html, ES modules, three r160+ from unpkg import map, EffectComposer/UnrealBloom from examples/jsm):

Scene:

• Room: big floor (dark, reflective via MeshStandardMaterial with envMap? or use a simple Reflector? Mirror floor used before in spume. Could use MeshReflectorMaterial-like custom — too heavy; use standard material with high metalness low roughness and environment), back wall panel grid with sequencer pads.
• Instruments arranged in arc:
  • Marimba bars (BoxGeometry rounded) in a row, 2 octaves pentatonic (C major pent: C D E G A). 15 bars.
  • Drum kit: kick drum (cylinder), 2 toms, snare.
  • Cymbal plates (flattened cylinders, metallic).
  • Bell tubes hanging (cylinders) — 5 tubes.
• Launchers above each instrument group: ball spawns from a launcher and arcs to the pad.
• Ball recycling: after hit, ball bounces to a collection trough (inclined plane) rolling to an elevator that glows; purely visual: balls fade out after a few bounces, and the "recycler" tube pulses. Keep simple but pretty.
• Step timing: BPM ~ 96, 16 steps per bar, lookahead scheduler: schedule step events 0.15s ahead; for each active pad, compute launch time = hitTime - flightTime; spawn ball with ballistic velocity toward target; when ball crosses target plane within window, trigger sound + visual at hitTime. Actually simpler: spawn at launch time with v0 = (target - start - 0.5gt²)/t. Then detect collision with pad box at approximately hitTime; trigger exactly on collision, quantization error small. Even simpler & robust: trigger the sound exactly at scheduled hitTime and force ball position to target at that moment if close (they will be since we computed ballistics exactly). Then bounce off with reflected velocity with some restitution and random lateral spread.

Ballistic solver: p0 start, p1 target, T flight time, g = (0,-9.81scale?,0). v0 = (p1 - p0)/T - 0.5gT... precisely: p1 = p0 + v0T + 0.5gT² → v0 = (p1-p0)/T - 0.5gT. Yes.

After hit: v = reflect about pad normal (up): v.y = -v.y * restitution (0.55), add small random x/z. Then simulate with gravity, bounce off floor (y=ballRadius) with restitution 0.5, fade after ~2.5s.

Use InstancedMesh for balls (say max 256) with per-instance color, updated from a CPU pool. Good perf.

Pads/instruments glow: each instrument bar has emissive intensity animated (attack-decay). Store per-mesh "hitTime" and animate emissive = f(t - hitTime). Also spawn a ring/particle burst at hit.

Sequencer UI: build in DOM (grid of buttons) overlaid at bottom-left? Better: an HTML panel with 4-6 tracks × 16 steps. Tracks: Kick, Snare, Hat(cymbal), Marimba A (melody), Marimba B (harmony), Bells. Each pad toggles. For marimba tracks, the note chosen at a step could cycle through a generated melody line rather than a fixed pitch... Better UX: marimba steps are "trigger current melody note" — no. Let's do: each pitched track has a pattern of note indices auto-generated (editable via regenerate), and the grid toggles steps on/off. Melody generation: random walk on pentatonic scale over chord tones.

Alternatively simpler and more fun: each pitched pad has fixed pitch = step index mapped to scale (so columns are pitches? no, columns are time steps).

Keep: toggle steps; note pitch per step from generated sequence; regenerate button makes new musical patterns.

Also chord progression: every 2 bars, shift root/scale slightly (pentatonic keeps it safe); marimba note generator follows.

Audio synthesis:

• Marimba: osc bank: f, 4f, 10f with quick decay, lowpass.
• Bells: inharmonic partials (1, 2.76, 5.4, 8.9) long decay.
• Kick: sine pitch drop 150→50Hz + click.
• Snare: noise burst bandpass + 200Hz body.
• Hat/cymbal: highpassed noise, short/long decay.
• Gong: multiple detuned partials slow.
• Reverb: ConvolverNode with generated impulse (noise decay) — nice! Cheap generative reverb.
• Master: compressor → destination.

Scheduler: setInterval 25ms, lookahead 0.12s, steps at 16th notes with swing.

Visuals polish:

• UnrealBloomPass + custom final grade pass (vignette, grain, slight chromatic) — reuse pattern from previous demos presumably; write fresh.
• SpotLight cones: translucent cone meshes with additive shader (fresnel-ish fade), flicker slightly.
• Dust motes: Points drifting.
• Hit rings: expanding torus/ring meshes additive fading.
• Floor: large plane, MeshStandardMaterial color dark, roughness 0.3, metalness 0.6 with a subtle grid texture generated on canvas. Plus fake reflection: place mirrored copies? Too heavy. Use contact shadow-ish. Fine.

Camera: OrbitControls + cinematic auto-path toggle.

HUD: top-left title, stats (BPM, bar, ball count); controls: Play/Pause (Space), Tempo slider, Swing, Regenerate (R), camera (C), quality, mute (M), snapshot (P). Touch support: pads are HTML so fine; orbit controls handle touch.

Structure code cleanly with comments. Aim ~1200-1500 lines single file. Let me also double check the three.js CDN version used in recent demos to stay consistent.

Let me peek at 060's imports quickly.

Consistent pattern: three@0.160.0 via unpkg import map. I'll use the same.

Now let me create demo 061: "Carillon" — a kinetic ball music machine (Animusic-inspired).

Let me now write the full demo. I'll be careful with:

• Audio scheduler (lookahead, swing)
• Ballistic aiming physics
• InstancedMesh balls
• Instruments layout
• Sequencer UI (DOM grid)
• Bloom + grade shader pass
• HUD, controls, resize, quality tiers

Layout plan (units: meters, machine ~ 14m wide):

• Floor at y=0.
• Back wall at z=-4.5 with sequencer pad panel glowing? Actually sequencer UI in DOM is more usable; but a 3D pad wall showing playback state looks cool. I'll do both: DOM grid for editing, and the launchers light up per step in 3D. Hmm, keep 3D simple: a "step rail" of 16 small lights above each track showing the playhead. Or skip; instruments glow on hit anyway. I'll add small launcher pistons that recoil on launch.

Instrument layout (x from -7 to 7, z around 0):

• Marimba (melody track + harmony track): two rows of 8 bars each (one octave pentatonic C D E G A C D E + ... let's do 10 bars: C4 D4 E4 G4 A4 C5 D5 E5 G5 A5). Row A (melody) at z=-1.6, row B (harmony) at z=-0.8? Hmm, marimba bars side by side like real marimba: bars along x, decreasing length with pitch. Two marimbas: left marimba (melody) x from -6.5..-1.5, right marimba (harmony) x from 1.5..6.5? Center reserved for drums.

Plan:

• Left: Marimba A, 10 bars, x ∈ [-6.6, -2.0], z = -0.5, bars laid along x.
• Right: Marimba B, 10 bars, x ∈ [2.0, 6.6], z = -0.5.
• Center: drum kit: kick (x=0, z=0.6, big cylinder lying), snare (x=-1.1, z=1.1), rack tom (x=0.4,z=1.2), floor tom (x=1.2, z=0.9).
• Cymbals: two plates on stands at (x=-1.6, z=-0.2) and (x=1.8, z=-0.3), tilted.
• Bell tubes: 6 tubes hanging from a frame at back z=-2.6, x ∈ [-2.5..2.5].
• Launchers: above/back, one per track group, mounted on an overhead gantry at y≈5, z=-3. Balls arc from launcher to target.

Track → target mapping:

• Track 0 "Kick": kick drum head.
• Track 1 "Snare": snare.
• Track 2 "Toms": alternate rack/floor tom.
• Track 3 "Hats": closed hat = small cymbal plate hit (short), occasionally open — just use cymbal A/B alternate.
• Track 4 "Melody": marimba A bars by note index.
• Track 5 "Harmony": marimba B bars by note index.
• Track 6 "Bells": bell tubes by note index.

That's 7 tracks × 16 steps. DOM grid of 112 pads — fine.

Flight time per track: fixed T ≈ (a bit less than a beat). At 100 BPM, 16th = 0.15s; launch 3 16ths before target maybe. Use per-step: launch time = hitTime - T_flight, T_flight = 2.5 * stepDur clamp [0.28..0.45]. Schedule both launch (spawn) and hit (sound) via scheduler: at launch time push ball with computed v0; at hit time play sound and force-position ball at target (they coincide). After that ball bounces freely with physics.

Ball physics after hit: velocity from ballistics at target: v = v0 + g*T → reflect y with restitution 0.5, add random horizontal scatter, then integrate; bounce on floor plane y=r; also bounce off a "collection backboard"? Keep floor bounces + fade after 2.2s with scale-down.

InstancedMesh balls: capacity 512. Sphere geometry r=0.09, MeshStandardMaterial metalness 0.9 roughness 0.15 with instance colors (per track hue). Emissive per instance not supported directly — use MeshBasicMaterial-ish? With bloom, bright colors suffice: use MeshStandardMaterial with emissive white*0.35 and instance color? instanceColor affects diffuse only. Trick: use MeshBasicMaterial with vertex-ish bright colors → they'll bloom. But then no shading. Alternative: MeshStandardMaterial + set instanceColor bright (values >1 via color multiplier? allowed). Use standard material, color white, metalness 0.6 roughness 0.25, and per-instance color saturated; plus scene has env-ish lighting. They'll look decent. For extra pop, add a small additive sprite trail? Skip trails; add impact ring particles instead.

Impact FX: pool of ring meshes (RingGeometry, additive, fade+scale) + small spark Points burst. Also pad emissive flash.

Generative music engine:

• Scale: major pentatonic on root C (C D E G A). Progression shifts between C / F / G / A minor pentatonic? Pentatonic safe: roots C3=130.81. Progression: [C, F, G, F] or [C, Am pent same notes, F, G]. Pentatonic over any chord of C major scale sounds fine mostly. Keep root changes subtle: transpose melody generation center.
• Pattern generator per track with density params and euclidean-ish rhythms:
  • Kick: steps {0,8} + occasional {10} etc. euclidean(3..5,16) rotated.
  • Snare: {4,12} + ghost.
  • Toms: sparse fills, more at bar end.
  • Hats: euclidean(6..10,16).
  • Melody: random walk from chord tone, density ~0.45, rests, octave jumps rare; record note index per step (or null).
  • Harmony: sparser, follows melody-ish (same rhythm subset, different pitch path).
  • Bells: very sparse, long — steps 0 and 8-ish, high notes.
• Every 4 bars advance chord; on chord change optionally regenerate a track's notes lightly.

Regenerate button: full new patterns.

Audio synth (WebAudio):

• ctx created on first user gesture (Play button / any click). Autoplay: start paused with "▶ Play" overlay prompting click (required by browsers).
• Master: gain → compressor → destination; plus convolver reverb send (generated IR: 1.8s noise decay stereo).
• marimba(freq): osc sine f *1 + triangle 4.01f(0.25) + 9.9f(0.1); exp decay ~0.9s; slight lowpass; velocity.
• bell(freq): partials [1,2.76,5.40,8.93] gains [1,.5,.25,.1] decay 2.5s.
• kick: sine 160→48 exp over 0.12s, gain env 0.25s + click (short noise hp 1500, 20ms). Thump.
• snare: noise bp 1800 Q1 + tone 190Hz; decay 0.18s.
• tom(freq): sine freq→freq*0.6, decay .3.
• hat: noise hp 8000, decay .05/.12.
• cymbal: noise hp 5000 + few square partials, decay 1.2s — simpler: filtered noise 1.5s.
• Sounds triggered with tiny random velocity humanization.

Scheduler: stepDur = 60/bpm/4; swing applied to odd 16ths: t += swingstepDur0.5? Standard: delay offbeats by swing*stepDur. lookahead 0.12s timer 30ms. Per scheduled step: for each active pad → scheduleHit(instrument, noteIndex, time). For ball tracks compute launchTime = time - flight; if launchTime < now+lookahead → schedule launch at max(now, launchTime) via setTimeout-ish mapping (ctx time → performance). Simpler: since lookahead 0.12 and flight ~0.35, schedule launch immediately when hitTime - flight <= now + lookahead and not yet launched; ball uses ctx-time-based integration: store t0 = launchTime (audio clock), and in render loop compute ball age = ctx.currentTime - t0, position analytic until hit (p(t) = p0 + v0 t + ½ g t²), then physics after. Analytic pre-hit = perfectly synced.

Balls: spawn max rate: 7 tracks × 16th at 140bpm ≈ 0.107s per 16th; worst all tracks ≈ 9 notes/s... plus bounces live 2.2s → ~40 alive. Capacity 256 plenty.

Camera: start cinematic orbit (slow), OrbitControls enabled; 'C' toggles auto-orbit.

Stage:

• Floor: circular platform r=11, dark reflective (MeshStandardMaterial, envMapIntensity via scene.environment from RoomEnvironment? RoomEnvironment addon + PMREMGenerator gives nice reflections cheap). Use RoomEnvironment for env lighting — good for metallic balls/cymbals.
• Fog dark blue. Background gradient via large sphere shader or scene.background color + fog.
• Spotlights: 3 SpotLights with shadows (1 casting). Volumetric cones: additive cones with radial fade shader, opacity ~0.06, following spotlights; subtle flicker.
• Gantry: metallic truss (boxes) overhead where launchers sit; launcher per track: small cylinder barrel + emissive ring, recoils on launch.
• Sequencer playhead: 16 small glowing studs on a rail at front of stage? Add a light bar on the gantry: 16 small emissive spheres indicating current step. Nice touch.
• Dust: Points ~300 drifting in cone area.
• Confetti? no.

Post: EffectComposer: RenderPass, UnrealBloomPass (strength ~0.85, radius .5, threshold .8), final ShaderPass (grade: lift/gamma-ish ACES? keep: vignette, grain, slight saturation, chromatic aberration at edges). OutputPass for color space (three r160: use OutputPass).

Quality tiers: High (pixelRatio ≤2, shadows 2048, bloom on), Med (pr 1.5, shadows 1024), Low (pr 1, shadows off, bloom half res). Auto by fps sampling.

HUD (DOM):

• Title "Carillon — Kinetic Ball Music Machine".
• Buttons row: Play/Pause, Regenerate, Camera, Quality, Mute, Snapshot.
• Sliders: Tempo (60–150), Swing (0–60%), Volume.
• Sequencer grid: 7 rows labeled, 16 pads; pads show active; current step column highlighted via class; marimba pad title tooltip shows note name.
• Help line: keys [Space] play/pause, [R] regenerate, [C] camera, [M] mute, [P] snapshot, [1-7] toggle track mutes? (maybe too much; add track mute buttons in row labels — click label to mute. Good.)

Ball recycling visuals: I'll add a "collector" glowing trench at front (z=2.5) with slight funnel? Balls just bounce and fade — fine. But an elevator vibe: skip; keep scope sane.

Edge cases: WebAudio requires gesture → overlay "Click to power up the machine". Pause → ctx.suspend? Keep ctx running, scheduler gated by isPlaying; playhead resets or holds.

When paused: no new scheduling; balls finish their arcs.

Timing integration in render loop: dt = clock delta capped 0.05; physics for post-hit balls uses dt; pre-hit analytic uses audioCtx.currentTime (if ctx suspended/paused use performance-based). Simplify: maintain own master clock: audioTime = ctx.currentTime always (ctx never suspended once created). When paused, we don't schedule; already-scheduled hits still play (fine, short tail).

Swing: applied to launch & hit both (launch scheduled relative to hit, so fine).

Melody note storage: melodyNotes[step] = scaleDegree or null; harmonyNotes similarly; bellNote per step. Tom track alternates drums by step parity; hat track alternates closed/open (open on "and" steps odd).

Marimba bar pitch mapping: degrees 0..9 → pentatonic across 2 octaves: midi base C4=60: pattern [0,2,4,7,9] per octave. note = 60 + oct12 + pat[deg%5], freq = 4402^((m-69)/12).

Harmony: base 48 (C3)? Marimba B lower: base 55? Use base 48→ warmer; transpose +12 if melody high. Just base C3=48 + pattern, 2 octaves.

Bells: 6 tubes: degrees of upper pentatonic [C5, D5, E5, G5, A5, C6] (72..84).

Chord progression: array of {root offset semitones, name}: [{0,'C'},{5,'F'},{7,'G'},{5,'F'}] applied to melody/harmony/bell generation (transpose by chord root relative). Visually show current chord in HUD.

Bar counter & chord display update per scheduled bar (schedule via step==0 events at audio time → setTimeout to update DOM in sync; simpler: update DOM in scheduler loop when scheduling step 0 — slightly ahead, acceptable; or compute display from ctx.currentTime in rAF: bar = floor(t/ barDur). I'll compute playhead/step in rAF from ctx.currentTime when playing: step = floor((t - t0)/stepDur + 0.5?) — scheduling uses incremental nextStepTime; for display compute from same counters: keep songStartTime and total steps; display step = floor((ctx.currentTime - songStartTime)/stepDur) % 16 accounting swing (ignore swing for display).

Implementation detail — scheduler:

On play start: songStartTime = ctx.currentTime + 0.06; stepCounter=0.

Playhead display: stepsElapsed = floor((now - songStartTime)/stepDur) (only when playing and now>=songStartTime); step16 = stepsElapsed %16; if changed → update DOM classes + gantry lights.

Launch scheduling inside scheduleStep(s, tHit): for each track with pad[s] active and not muted:

• if pitched: note = notes[s] (if null skip).
• launchT = tHit - flightTime(track); if launchT < ctx.currentTime - 0.01 (too late) skip ball but still play sound.
• balls.spawn({t0: launchT, p0, target, v0 computed, hitAt: tHit, track}).
• audio.trigger at tHit.

Flight time: make it musical: flight = 3*stepDur clamped [0.25, 0.5]. Fine.

v0 = (target - p0 - 0.5gflight²)/flight with g=(0,-G,0), G=9.8. Works.

At render: for each ball: if now < t0 → hide (scale 0). else if now < hitAt: p = analytic. else: if !ball.loose: set pos=target, vel = (v0 + gflight); reflect vy = -vy0.45; add scatter; loose=true. else integrate: vel.y -= Gdt; pos += veldt; if pos.y < r: pos.y=r; vel.y=-vel.y0.55; vel.x=0.98... if now > dieAt: release. Write matrix to InstancedMesh.

Also muzzle flash: launcher ring flash + recoil anim keyed by lastLaunchT per track.

Hit FX at tHit: can't run JS exactly at tHit; but balls update in rAF checks crossing: when ball transitions past hitAt in a frame → trigger visual FX (ring, pad flash, sparks). Slight ms jitter OK — sound already scheduled exactly.

Pad flash: instrument mesh emissiveIntensity = 3 → decay in update.

Sequencer DOM: build table. Rows: name button (mute toggle) + 16 pad buttons. Pad states arrays bool[7][16]. Clicking pad toggles. For melody/harmony/bells rows, active pad with null note → auto-assign note on toggle (pick from scale), so user pads always sound. Also right-click? no.

Grid CSS: grid-template-columns: 90px repeat(16, 1fr); pads aspect-ratio 1, gap 4px; beat groups (every 4) separated.

Colors per track: kick #ff5a5a, snare #ffb84d, toms #ff7ad9, hats #7dd8ff, melody #8affa0, harmony #4dd2ff, bells #d0a2ff. Ball instance colors match track.

Snapshot: render then canvas.toBlob → download link.

Keys: Space, R, C, M, P, Q (quality cycle).

Resize handler. visibilitychange → keep running? fine.

Auto quality: measure avg fps over 3s after 4s; drop tier if <45.

Structure the file with clear sections & comments. Also add . Title/description meta.

Camera: perspective 45°, pos (0, 6.5, 12), target (0, 1.6, -0.5). Auto-orbit: azimuth slow drift ±, radius breathe; when user interacts (pointerdown on canvas) disable auto until 'C' pressed.

Lighting: hemi dim (0x2a3550/0x0a0c12, 0.6), key SpotLight (0xfff2dd, 60, pos (6,9,6), angle .5, penumbra .5, castShadow, map 1024/2048), rim SpotLight cyan from back-left, magenta small from back-right, plus small ambient. Emissive materials drive bloom.

Floor reflections: MeshStandardMaterial({color:0x0d1017, metalness:0.85, roughness:0.35, envMapIntensity:0.7}) + scene.environment = pmrem(RoomEnvironment). That yields glossy dark floor reflecting balls' bloom? Bloom is post; reflections need actual bright objects: balls are bright via instanceColor saturated — but MeshStandard instanceColor is diffuse; reflection of them in floor works since they're rendered meshes. Good enough.

Also add subtle grid texture on floor: canvas radial grid lines → map with low intensity. Keep simple: generate canvas 512 with faint rings/lines, repeat.

Marimba bars: RoundedBox? Not in core; use BoxGeometry with slight bevel via scale — fine. Bars: length varies 0.9→0.55, width 0.32, height 0.08, on two support rails (boxes), resonator tubes below each bar (open cylinders, length ∝ 1/freq) — nice detail, cheap (cylinders). Wood color per track hue? Keep marimba A warm amber, B teal.

Drums: cylinder shells (open) with emissive rim ring (torus) that flashes; head = circle mesh flashing.

Cymbals: flattened cone/cylinder (LatheGeometry quick) gold metallic; flash emissive.

Bells: metal tubes hanging from frame; hit flashes.

Gantry: two posts + top beam + 7 launcher pods (box + barrel cylinder + emissive ring).

Step rail: 16 small spheres on gantry beam, lit when step active.

Ring FX pool: 24 meshes additive RingGeometry rotated flat, each with life.

Spark pool: 8 Points systems of 20 pts? Simpler: one Points with 400 verts, CPU update, spawn burst sets positions/velocities/life, additive, size attenuation. Colors per burst via vertexColors. Do it.

Dust: Points 250 slow drift additive faint.

Now audio function details:

Master chain: masterGain(0.9) → compressor → destination. Reverb: sendsum GainNode(0.35) → convolver → master.

Note humanization: vel = 0.9+rand0.15; timing +rand*4ms (schedule t + jitter small; keep balls synced to non-jittered tHit though — tiny mismatch fine, or apply same jitter to ball hitAt: pass tHit+jitter to both. I'll jitter both identically.)

Tempo slider: changing bpm mid-run affects next scheduled steps (stepDur read live). Swing likewise.

Volume slider → masterGain.

Mute → masterGain 0 (store).

Track mute buttons: mute[i] toggle.

Pattern gen (euclidean):

Simple method: pattern[i] = floor((ik)%n) < k hmm use: for i in 0..n-1: ((ik)%n) < k gives even spread. rotate by rot.

Kick: euclid(3,16,rot random of {0,0,2}) ensure step0=1 (set arr[0]=true). Snare: arr[4]=arr[12]=true; maybe 15 ghost 25%. Toms: euclid(3,16,rand) AND sparse: keep only if rand<0.7 → density low; ensure some on 14/15 for fills sometimes. Hats: euclid(7,16,rot). Melody: density 0.4-0.55: iterate steps: active = rand<d; strong beats (0,4,8,12) bias 0.75. Note walk: start deg 4; step: deg += choice([-2,-1,-1,0,1,1,2]) clamp 0..9 with bounce; chord-tone bias on beats. Harmony: subset of melody rhythm (active if melody active && rand<0.5) or own sparse euclid(4,16); pitch = melodyDeg ± 2 or walk lower. Bells: steps {0, 8} 50%, note random high degree. Apply chord transpose: semitone shift per chord index from progression [0,5,7,5] — but shifting pentatonic by F(5): C pent notes +5 = F G A C D = F pent — perfect, stays pentatonic. +7 → G A B D E — B not in C pent but G pent — fine musically.

freq(trackDeg, chordShift, base) compute midi then freq.

Melody octave: base 60 (C4) + shift; Harmony base 48+shift+12? = 60 too... make harmony base 55? pentatonic from G2? Use base 48 (C3) +12 = 60 same as melody — conflict. Set harmony base 48, degrees 0..9 same pattern → C3..A3 range. Good separation. Bells base 72.

Alright — also a "chord pad" background: soft synth pad playing root+fifth at chord change, quiet, adds glue. Implement padChord(rootMidi): 3 detuned saws through lowpass 800, gain 0.05, long attack/release 2 bars. Yes — makes it sound much better.

Bass line: on kick hits add sub bass note = chord root midi-12? Kick track doubles as bass? Add separate synth bass triggered with kick: sine/triangle at root midi (36+shift) short pluck. Adds groove. Fold into kick trigger: playBass(root at current chord).

Current chord known at schedule time (bar index → progression[(bar/1)%4]? change every bar? every 2 bars: progression idx = floor(bar/2)%4.)

I think feature set is rich. Now write the code. Single HTML ~ large. Let me write it carefully, then do a quick syntax check with node (can't run browser, but can at least parse JS via node --check after extracting? The module imports 'three' — node --check only parses, doesn't resolve imports, so syntax check works).

Let me write the file now. I'll write it in chunks to /space/demos/061-carillon/index.html. Actually name: "061-carillon"? Carillon means bell tower... The demo is broader: marimba/drums/bells. Names: "Percussion Engine", "Klangmaschine", "Marble Music Machine", "Percussatronic", "Ballphony"... I'll go with folder 061-klangwerk and title "Klangwerk — Kinetic Ball Music Machine". Nice.

Write index.html now. Careful with:

• import map
• module script
• no top-level await needed except none.
• Use OutputPass from 'three/addons/postprocessing/OutputPass.js'.

Custom grade pass: ShaderPass with uniforms tDiffuse, time, resolution; vignette + grain + chromatic aberration + slight teal-orange grade. Put before OutputPass? OutputPass does tone mapping/sRGB at end. Bloom works in linear HDR; grade after bloom in linear, then OutputPass. ACESFilmicToneMapping on renderer with OutputPass handles conversion. Set renderer.toneMapping = ACESFilmic; toneMappingExposure ~1.1.

Grain needs time uniform — update per frame.

Shadows: renderer.shadowMap.enabled = true, type PCFSoft. Only key spotlight casts. Balls cast shadow? InstancedMesh castShadow true — ok 256 instances fine. Bars receive+cast. Floor receives.

Let me write it.

Also ensure THREE.ColorManagement default fine.

Pad flash: keep array of {mesh, base: color, flash: 0..1} update emissiveIntensity = flash*3 (+base small). Materials need emissive set to track color; use MeshStandardMaterial({color, emissive: color, emissiveIntensity: 0.15}).

Drum heads: MeshStandardMaterial white-ish emissive flash.

Cymbal flash similar (emissive gold).

Bell tubes emissive slight purple.

Gantry step LEDs: MeshBasicMaterial small spheres; set color bright when active step (scale pulse).

Launcher pods: ring MeshBasicMaterial additive flash on launch; recoil: pod.position.z += kick decay.

Note name tooltip: title attr on pads with note name for pitched tracks.

Track rows config:

Targets (3D positions) per track: define targetPoint(trackIdx, noteIdx, step):

• kick → (0, 1.05, 0.6) head top? Kick drum lying: cylinder axis along z? Kick head facing up so balls can bounce on it → kick as floor tom style (head up). Fine: kick at (0,0.55,0.9) radius .55 height .5, head top y≈0.8. target (0,0.82,0.9).
• snare (-1.2,0.62,1.3)
• toms: rack (0.5,0.78,1.5) floor (1.35,0.7,1.2): alternate by step%2.
• hats: cymbalA (-1.9,1.15,0.2), cymbalB (2.0,1.2,0.1) alternate; open hat uses cymbalB longer decay.
• melody: bar position along x: marimba A centered x=-4.3, bars i=0..9: x = -4.3 + (i-4.5)*0.42, z=-0.5, y=0.9.
• harmony: center x=+4.3 same z.
• bells: tubes x = (i-2.5)*0.55, y=1.9, z=-2.4.

Launchers on gantry y=4.6, z=-3.2; per track x: kick 0, snare -1.5, toms 1.5, hats 2.6, melody -4.3, harmony 4.3, bells 0. Launch p0 = pod pos.

Flight dir mostly down-forward. G=9.8, flight ~0.32s: v0 mostly horizontal-ish... compute anyway.

Ball radius 0.09.

After hit loose physics with floor y=r bounce, plus slight attraction to collector? Just fade.

dieAt = hitAt + 2.0 + rand*0.6; scale out last 0.25s.

OK writing now. Also HUD chord readout: show "C pent → F pent …". Update when scheduling bar starts (store displayQueue with time → update via rAF comparing ctx.currentTime).

Simplify: compute in rAF: if playing: elapsed=ctx.currentTime-songStart; bar=floor(elapsed/(stepDur*16)); chordIdx=floor(bar/2)%4; update DOM if changed. Note: stepDur may change with tempo slider mid-song → bar calc drifts. Track scheduling with own counters; maintain scheduledBarCount & scheduledStepTime0… For display robustness, store array barStartTimes when scheduling (push time at each bar start) then display picks last barStartTime <= now. Cheap.

Same for step display: store stepTimes ring buffer of last 64 scheduled {step,time}; display finds latest <= now.

Also regenerate applies to patterns immediately for next scheduled steps (patterns read at schedule time). Chord used at schedule time too — consistent.

One catch: scheduleStep needs note per step for pitched tracks: melody pattern notes array melodyNote[16] (deg or null). If pad active && note==null → treat as inactive? For user-toggled pads, we auto-assign note when toggling. Regenerate assigns notes only to active steps. OK.

Pad chord at bar start: schedule at bar boundary (step 0): pad chord gain env, root = 36+shift.

Alright, also "master" reverb send level per instrument in trigger (marimba 0.35, bells 0.6, drums 0.2, hats 0.25, pad 0.8).

Time to write. I'll aim for well-organized ~1400 lines. Let me write the file via heredoc (careful with backticks/$ in JS template literals — use quoted heredoc 'EOF' to avoid shell interpolation).

Actually the file is large; I'll write it in a few sequential appends with quoted heredocs to be safe. Or one big write via read_write_file_in_shell_environment (write mode) — that's designed for this and avoids heredoc pitfalls. The content is long (~60KB) — tool should handle. Let me compose carefully.

I'll write it in 3 parts using write + append via execute_shell_command cat >> with quoted EOF to reduce risk of one giant payload failing... The read_write_file tool with full content is cleaner. Let me try one full write; if too large, split.

Let me draft the code mentally section by section to keep it coherent:

1. HTML head, CSS (HUD, sequencer grid, overlay).
2. body: overlay start screen, HUD (title, transport, sliders, sequencer, hints), canvas container.
3. importmap.
4. module script:
   • imports
   • CONFIG/constants
   • state
   • audio engine (init on gesture): ctx, master, comp, reverb, noise buf, IR; synth fns: marimba, bell, kick, bass, snare, tom, hat, cymbal, padChord; triggerRouter(track, noteDeg, t, vel).
   • music theory: scales, progression, pattern gen (euclid, genPatterns()), note freq.
   • scene setup: renderer, camera, controls, environment (RoomEnvironment pmrem), lights+cones, floor, gantry, instruments (build functions returning meshes + registering flashable targets), step LEDs, balls InstancedMesh, rings pool, sparks points, dust.
   • ball system: spawn/update matrices.
   • FX: flash(meshKey), ringBurst(pos,color), sparks(pos,color).
   • scheduler: scheduleStep, lookahead loop via setInterval.
   • transport: play/pause/regen; UI events; keys; sequencer DOM build & sync.
   • render loop: dt physics, instrument flash decay, LED update, launcher recoil, cones flicker, dust drift, camera auto-orbit, quality auto-tune, composer render, grain time.
   • resize, snapshot, quality tiers.

Also handle WebAudio not yet initialized when user toggles pads: fine (patterns only).

Start overlay: big button "⚙ Power Up" → initAudio(), play(). Also allow browsing scene before start (render loop runs; scheduler idle).

Ball spawn before ctx exists impossible since only scheduler spawns. Good.

Mute via masterGain.

Volume slider 0..1 → masterGain.gain.

Snapshot: composer.render() then toDataURL — need preserveDrawingBuffer or render immediately before capture: call renderer.render via composer then canvas.toBlob synchronously — works without preserveDrawingBuffer if done in same frame. I'll do: composer.render(); canvas.toBlob(...) in same tick.

Quality: pixelRatio & bloom resolution & shadow map size toggles; three tiers button cycles + auto.

Track note generation details:

genPatterns(rand): as designed. melody deg walk store.

Chord progression: PROG=[{n:'C',s:0},{n:'F',s:5},{n:'G',s:7},{n:'F',s:5}].

At scheduleStep(s,t): chordIdx=floor(bar/2)%4 (bar increments after step 15). shift=PROG[chordIdx].s.

For pitched tracks: midi = degToMidi(noteDeg, base, shift). velocity by accent (beats stronger).

Trigger mapping to instrument visuals & audio:

• kick: audioKick(t,vel), audioBass(mf(36+shift), t, vel*0.9); visual flash kickHead.
• snare: audioSnare.
• toms: step%2? rack:freq 180 : floor 120; flash respective.
• hats: closed: audioHat(t,vel,open=false) + cymbalA flash small; open (odd step && rand? deterministic: s%4==3) → open.
• melody: audioMarimba(f,t,vel,pan); flash bar mesh; ring at bar pos.
• harmony: same lower, softer vel.
• bells: audioBell; flash tube.

Ball spawn for every triggered note (pitch tracks too) targeting the pad/bar hit point. That's the core visual! Every note = a ball.

Ball target y = padTopY + r.

Great. Also on bar start: padChord (soft saw pad) + subtle gantry pulse.

Enough planning — write it.

For RoomEnvironment import: 'three/addons/environments/RoomEnvironment.js'.

Grain/grade shader code — write standard.

Edge: three r160 UnrealBloomPass constructor(resolution: Vector2, strength, radius, threshold).

OrbitControls: enableDamping, target (0,1.4,0), maxPolarAngle ~ 1.45 (don't go under floor), minDistance 4, maxDistance 26.

Auto camera: if autoCam && !userInteracting: azimuth = baseAz + t0.06; radius = 12.5 + sin(t0.11)1.5; height = 6.2 + sin(t0.07)*1.2; set camera pos via spherical around target; controls.update still fine (it will fight? Setting camera.position then controls.update recomputes from current position — ok as long as target fixed). Standard trick works.

On user pointerdown on renderer canvas → autoCam=false (until C pressed or button).

Sequencer current-step highlight: keep lastDisplayedStep; toggle classes.

Track mute: row label button toggles .muted class & mute[i].

Density guard: balls capacity 256, if full reuse oldest.

Write CSS: dark theme consistent with other demos (#0a0a0f etc.), HUD top-left panel, sequencer bottom-center panel, overlay center. Mobile: sequencer scrollable horizontally.

Let me now also think about pad note assignment on user toggle for pitched tracks: on toggle ON: if note null → assign: melody: nearest scale walk from previous non-null ± rand step; simpler: note = clamp(prevNote + choice(-1,0,1), 0..9) or 4 if none. bells: note = rand 0..5. harmony similar. Good.

Persist? Not needed.

Now, finally, write the whole file. I'll produce it in one write call. Let me carefully compose (~1300 lines). I must avoid syntax errors. I'll then extract JS and node --check it.

Note on template literals inside the HTML: fine inside script.

Let me write.

Now write the big index.html. I'll compose it fully and write with the write tool. Let me carefully write the code.

I wrote the file, but I noticed some issues I need to fix:

1. vMarimba function is broken/dead code — I left a broken function in there with osc('sine', ...).connect?.(e) which double-connects, and a weird g.disconnect(). I should remove vMarimba entirely since I wrote the cleaner marimba function.

2. marimba function has issues: p.connect?.(r) — r is created but p.connect(r) connects panner to r, then r isn't connected anywhere — that's a bug (harmless but wrong). Let me clean it up.

3. bus() and env() and osc() helper functions — env() and osc() and bus() are used only by dead vMarimba. noise() helper is used. Let me check each: bus — used only in vMarimba. env — only in vMarimba. osc — only in vMarimba. So remove vMarimba, env, osc, bus. Keep noise.

4. buildDrum has odd target logic: targets[name] && targets[name].set(x, h + BALL_R, z); targetV && targetV.set(...) — I passed no targetV. And targets.toms doesn't exist in the initial targets object — I created targets.tomRack and targets.tomFloor but buildDrum with name 'toms' tries targets['toms'] which is undefined → skipped, fine. Then I alias targets.tomRack.set(0.45, 0.5 + BALL_R, 1.75) — wait, buildDrum for 'toms' was called with (0.45, 1.75, 0.3, 0.5, ...) so h=0.5, and then I manually set tomRack to (0.45, 0.5+BALL_R, 1.75). That's consistent with h=0.5. But buildDrum('tomFloor', 1.5, 1.35, 0.36, 0.56) sets targets.tomFloor to (1.5, 0.56+BALL_R, 1.35) — wait, buildDrum sets targets[name] if exists. targets.tomFloor exists initially at (1.5, 0.85, 1.35) → gets overwritten to (1.5, 0.56+0.085, 1.35) = (1.5, 0.645, 1.35). Hmm but drum height h=0.56 means head at y=0.56. OK consistent.

   But wait: kick drum buildDrum(0, 1.05, 0.6, 0.72, ...) → h=0.72, target (0, 0.72+0.085, 1.05) = (0, 0.805, 1.05). Head at y=0.72. OK. Snare: (x=-1.35, z=1.55, r=0.34, h=0.42) → target y=0.42+0.085=0.505. OK.

   Hmm, but the initial targets object values get overwritten by buildDrum — but only for names that exist in targets: 'kick' ✓, 'snare' ✓, 'toms' ✗ (skipped), 'tomFloor' ✓. And tomRack manually. Fine.

5. queueFlash in scheduler uses flashMap names: 'kick', 'snare', 'toms', 'tomFloor', 'cymA', 'cymB', 'melody0..9', 'harmony0..9', 'bell0..5'. flashMap has: kick, snare, toms, tomFloor (drums), cymA, cymB, melody0-9, harmony0-9, bell0-5. ✓ all present.

6. Ball spawn for launcher L.queuedAt = t0 — I set that but never use it; harmless. Also L.heat = 1 at schedule time, which is up to flight+lookahead before impact — the ring will cool by impact (heat decays at 4/s; flight ~0.3-0.45s + lookahead up to 0.14 → ~0.6s → heat ≈ 0 at launch?? Actually heat should trigger at LAUNCH (t0), not at schedule time. The ring glowing at schedule time is wrong — it glows up to ~0.55s before launch and decays at 4/s so it'll be nearly gone by actual launch. I should queue launcher heat at t0. Let me add to flashQueue mechanism or a separate launcherQueue. I'll reuse flashQueue with a type field: {type:'launcher', ti, t0}.

7. updateBalls color: ballsMesh.setColorAt(alive, b.color) — setColorAt creates instanceColor on first call. Fine.

8. In animate, updateBalls(audioNow, dt): when AC is null (before init), audioNow=0, and no balls exist anyway. When paused, audioNow = AC.currentTime keeps running (ctx not suspended), balls continue. Fine.

9. Ball dieAt vs audio clock when paused: dieAt uses audio time; when paused ctx keeps running so they die on schedule. Good.

10. flashQueue unbounded when paused: scheduleStep only runs when playing. OK.

11. updatePlayhead(now) uses state.stepTimes — when paused, no new entries, playhead stays. Fine.

12. First setColorAt before instanceColor exists in updateBalls loop when count becomes 0: if alive=0, count=0, fine.

13. padEls paintPad with 'now' class logic — a bit convoluted but works.

14. Issue: scheduleStep may schedule ball launches with t0 already in the past (if lookahead scheduling happens late, e.g. t0 < now). Ball physics: for t in [t0, tHit] analytic; if now > t0 at spawn, ball just appears mid-arc — acceptable.

15. hat()/snare()/cymbal() use noise() then hp.disconnect(); hp.connect(e) — noise source connects to hp; hp initially connect(p) then disconnect and connect to e which connects to p. Slightly awkward but correct. But in cymbal and hat, hp.connect(p) happens before hp.disconnect(). Wait in hat: hp.connect(p) — created with hp.connect(p)? Let me re-read:

So hp→p, then hp.disconnect() removes that, hp→e→p. Net: noise→hp→e→p. Correct.

Same pattern in snare with bp: noise→bp→e→p. Correct.

In kick: noise(t, t+0.03, hp); hp.connect(c); c.connect(p); — noise→hp→c→p ✓.

16. marimba function bug:

p.connect?.(r) — connect exists so it connects p→r, and r → nowhere. Harmless (r dangling) but sloppy — remove.

Then lp.connect(p) and parts → e → lp → p → master, lp → send → reverb ✓.

17. bell: parts → e → p → master, p → send → reverb ✓.

18. Overlay click → play() ✓. Also Space dismisses overlay.

19. **state.notes[ti][step] for drums is null — let deg = state.notes[ti][step]; then if (deg === null) continue; only for pitched. Drums ignore deg ✓.

20. Scheduler step display: state.stepTimes grows unbounded? I splice at 128 ✓.

21. The grade shader: uses col *= vec3(1.04,1.0,0.96)*0.5 + 0.5; — a weird warm multiply; fine visually (mild).

22. bloom pass bloom.enabled — passes have .enabled property ✓.

23. controls.addEventListener('start', ...) sets autoCam false on any interaction — including when autoCam is moving camera? OrbitControls 'start' fires on user input (pointer/wheel), not programmatic. ✓.

24. applyQuality calls onResize ✓. key.shadow.map.dispose() guarded ✓.

25. In animate, when state.playing false and AC null, updatePlayhead(0) — stepTimes empty, s=-1, fine.

26. songline updates only when playing; balls count shown. OK.

27. Missing: initial ballMesh.instanceColor — setColorAt allocates. ✓.

28. spawnBall shift() when full — removes oldest but doesn't reorder instance writes (we rewrite all each frame) ✓.

29. THREE r160 LatheGeometry with Vector2 points ✓. Cymbal profile: points from (0, 0.06) to (0.48, 0)... LatheGeometry rotates around Y axis; points need x ≥ 0 ✓. First point x=0 fine.

30. RingGeometry rotation — rings rotated flat (x=-PI/2) ✓. Bell flash rings horizontal under tube ✓.

31. Marimba addMesh(..., grp) — grp at origin, positions absolute — fine, castShadow true.

32. key SpotLight params: new THREE.SpotLight(color, intensity, distance, angle, penumbra, decay) = (0xfff1da, 320, 40, 0.55, 0.55, 1.6). In r160 with physically correct lights default, spot intensity in candela — 320 works (common in examples ~ hundreds). OK.

33. scene.environment = pmrem.fromScene(new RoomEnvironment(renderer), 0.04).texture — RoomEnvironment in r160: constructor takes renderer? In r160, new RoomEnvironment() — actually RoomEnvironment(renderer) was old API; in r160 it's new RoomEnvironment()? Let me check: RoomEnvironment class in examples/jsm/environments/RoomEnvironment.js — constructor( renderer = null )? In r160 I believe it's just new RoomEnvironment() — it creates a scene; passing renderer is harmless/ignored. Actually historically: pmremGenerator.fromScene( new RoomEnvironment( renderer ), 0.04 ).texture was used in examples up to ~r15x. In r160, RoomEnvironment constructor signature: constructor() — no args. Passing an extra arg is harmless in JS. OK either way.

34. UnrealBloomPass threshold 0.78 with ACES tonemapping — bloom pass operates pre-output; values >0.78 in linear HDR bloom ✓. Emissive 2.6 intensity will exceed ✓. MeshBasicMaterial colors are 1.0 max — launcher rings additive opacity 0.9 might not exceed threshold... MeshBasicMaterial color like 0xff5a5a ≈ 1.0 red → luminance ~0.5? Threshold 0.78 might not catch it. But emissive flashes at 2.6 intensity will bloom nicely. Step LEDs MeshBasic 0xffe9c4 ~1.0 → borderline. It's fine — main bloom from emissive flashes + sparks (additive, bright) + rings.

Actually balls: MeshStandard metalness 0.9 roughness 0.22 with envMapIntensity 1.4 — reflections of RoomEnvironment will be bright-ish. OK.

35. Missing feature check — balls cast shadows with count=0 — fine.

36. renderer.domElement appended; stage div fixed inset 0 ✓.

37. bind helper for sliders ✓.

38. **Potential problem: scheduleStep uses state.notes[ti][step] for hats/toms — null, fine.

39. queueFlash positions for melody: barTargets.melody[deg] — deg clamped 0..9 ✓, array length 10 ✓. bells deg 0..5 ✓ (ensureNote picks 0..5; generate uses pick([0..5]) ✓).

40. In updateBalls, when b.loose false and now >= b.tHit — transition; but balls with t0 in future skipped via continue before the loose check ✓.

41. Ball scatter b.vel.z = b.vel.z * 0.25 + rnd(0.3, 1.1) — positive z = toward audience ✓ (audience at +z since camera at z=13).

42. **tinyClick uses AC and playing state; called from updateBalls with audio time — but it uses AC.currentTime directly ✓. It connects to master ✓.

43. **Overlay: clicking it calls play() — good. But overlay covers screen; keyboard Space also works before click? AC requires gesture; keydown counts as gesture for AudioContext resume in most browsers ✓.

44. seqhint mentions "on the downbeat arc" fine.

45. One more real bug: in buildDrum, the line:

targetV is a function parameter — never passed → undefined → undefined && ... fine. But targets.tomRack isn't set by buildDrum; I set manually after: targets.tomRack.set(0.45, 0.5 + BALL_R, 1.75) ✓ matches rack tom (x=0.45, z=1.75, h=0.5).

46. flashMap['toms'] — set in buildDrum('toms') ✓ used in queueFlash('toms') ✓.

47. In scheduler 'toms' case: queueFlash(rack ? 'toms' : 'tomFloor', ...) ✓.

48. In launchers build: TRACKS.forEach((tr, ti) => { const px = lx[tr.id]; ...}) — lx has keys kick, snare, toms, hats, melody, harmony, bells ✓ all 7.

49. **L.queuedAt = t0 unused — remove or keep harmless. I'll fix launcher heat timing via flashQueue typed entries.

50. **processFlashQueue iterates backwards, splices — fine with typed entries if I add type handling.

51. **sparkBurst before first render: sparkGeo attributes update ✓.

52. updateSparks sets needsUpdate on position every frame ✓; colors set at burst but never flagged needsUpdate! — sparkCol changes need sparkGeo.attributes.color.needsUpdate = true. Set it in sparkBurst. Important fix.

53. **rings color set per burst ✓.

54. **The dead vMarimba references osc/env/bus — all dead. Remove for cleanliness.

55. import { ShaderPass } ✓ used for grade.

56. iOS: maximum-scale=1.0, user-scalable=no ✓.

57. controls.target.set(0, 1.5, -0.4) ✓.

58. Auto-orbit camera math: camera.lookAt not called — controls.update() with enableDamping will orient camera toward target each frame since we set position. OrbitControls keeps its internal spherical from camera position relative to target, so setting position directly then update() works ✓ (it recomputes from current offset).

59. **bloom.strength adjusted in applyQuality ✓.

60. When tab hidden, setInterval throttled to 1s — scheduler lookahead 0.14s would cause gaps. Common issue; acceptable for a demo, but easy mitigation: on visibilitychange, pause. Actually a robust trick: increase lookahead to 0.3 and interval to 60ms — still throttled in background. Many demos accept audio hiccups when tab hidden. Alternatively drive scheduling from the rAF loop AND the interval (double-call safe since guarded by while nextNoteTime < now+lookahead). I'll also call schedulerTick() from animate — when visible, rAF runs at 60fps → tight scheduling even if interval throttled. When hidden, both throttled → gaps, acceptable.

Let me now rewrite the file with all fixes:

• Remove dead vMarimba/bus/env/osc helpers.
• Clean marimba (remove dangling r).
• sparkCol needsUpdate in sparkBurst.
• Launcher heat via typed flashQueue entries (fire at t0).
• schedulerTick also called in animate.
• Remove unused L.queuedAt.
• Also small: paintPad box-shadow string cleanup (fine as is).
• Also add state.playing guard so padChord etc not scheduled when muted? Mute just zeroes master — fine.

Also one more consideration: the initial targets object literal values are placeholders; buildDrum overwrites for kick/snare/tomFloor; cymA/cymB set via... wait — buildCymbal does NOT update targets! targets.cymA initial (x=-2.15, y=1.32, z=0.35) matches buildCymbal(-2.15, 0.35, 1.3) → cymbal top at y=1.3+~0.07 → target y 1.32 close ✓. cymB initial (2.3, 1.38, 0.25) matches buildCymbal(2.3, 0.25, 1.36) ✓. Good — but I should make it explicit: set targets inside buildCymbal. I'll add that.

Also targets.kick initial (0, 0.86, 1.05) vs computed (0, 0.805, 1.05) — buildDrum overwrites ✓.

Bell targets: y = 2.58 - len - 0.06 — bottom tip of tube; balls hit tube bottom ✓ nice.

One more: marimba bars z=-0.5 and launchers z=-3.4, y≈3.85 (pod at gy-0.85 = 4.7-0.85=3.85). Flight 0.26-0.5s: from (−4.35, 3.85, −3.4) to (−4.35, 0.99, −0.5): distance ~ sqrt(2.86² + 2.9²) ≈ 4.07m → v ≈ 8-15 m/s. Fine.

Kick launcher at x=0, target (0, 0.805, 1.05): dy=-3.05, dz=4.45 — longer flight ~0.45s ok.

Also balls pass through gantry? No, they travel down-forward.

Do balls hit the bell frame when targeting bells? Bell target (x, ~1.6-2.0, -2.5) vs gantry beam at z=-3.4 y=4.7 — arc passes over it fine (starts below beam at y=3.85).

Harmony marimba bars at x=+4.35; launcher harmony at x=+4.35 ✓.

Everything looks consistent. Let me also double check scheduleStep hat: if (open) cymbal(...) plus hat() — fine.

padChord at step 0 of bar 0 — chord root 36+shift (C2). ✓

Melody base 60 + chord shift — with PROG shift 5 → F pent ✓.

Now rewrite the full file cleanly with fixes. Also fix the marimba reverb send to come from lp (post filter) — already does.

Additionally, bell connects send from p (panner) — reverb gets panned signal, fine.

Also bus removal — make sure nothing else references bus(. And env( / osc( references — only in vMarimba. Careful: osc might collide... none elsewhere.

Also in kick(): noise(t, t + 0.03, hp) — noise() helper connects source→hp ✓ and start/stop ✓.

Let me also slightly improve: ballsMesh.setColorAt requires instanceColor allocated; after ballsMesh.count = 0 frames with no balls, setColorAt never called — fine.

One more subtle thing: updateBalls uses balls.splice inside reverse loop ✓.

And spawnBall when at capacity uses balls.shift() — O(n) fine.

Alright — also the CSS pad 'now' handling duplicates box-shadow logic; simplify: .pad.now { box-shadow: inset ... !important; } won't combine with glow... keep current approach (paintPad reads classList) — works.

Rewrite now with all fixes applied.

Now let me validate the JavaScript syntax by extracting the module script and running node --check on it. The script uses ES module imports, so I need to save it as .mjs and use node --check.

Syntax OK. Now let me run a quick static lint for common issues: check that all flashMap names referenced in scheduleStep exist, all target names exist, etc. Let me do a quick grep-based cross-check, and also simulate the pure-logic parts (pattern generation, euclid, degToMidi, ballistic math) in node with stubs to catch runtime errors in non-DOM/non-Audio code paths.

Let me write a small node test harness that:

1. Stubs out THREE? That's heavy. Instead, I'll extract and test only the pure functions by copy-pasting logic checks via grep consistency.

Simpler checks:

• All queueHitFX('name'...) names exist in flashMap assignments: kick, snare, tomRack, tomFloor, cymA, cymB, melody0-9, harmony0-9, bell0-5. flashMap assignments: buildMarimba sets flashMap['melody'+i] and 'harmony'+i (0..9) ✓; buildDrum sets kick, snare, tomRack, tomFloor ✓; buildCymbal cymA, cymB ✓; bells 'bell'+i (0..5) ✓.

• targets: kick, snare, tomRack, tomFloor, cymA, cymB ✓ used in scheduleStep: targets.kick ✓, targets.snare ✓, targets.tomRack/tomFloor ✓, targets.cymB/cymA ✓, barTargets.melody[deg] deg∈0..9 ✓, bellTargets[deg] deg∈0..5 ✓.

• launchers array has 7 entries in TRACKS order ✓ (TRACKS.forEach push) and spawnBall(ti...) indexes launchers[ti] ✓ — order matches TRACKS indices ✓.

• ensureNote uses TRACKS[ti].base !== undefined check in pad click — kick/snare/toms/hats have no base ✓.

• In scheduleStep 'melody' case: if (deg === null) continue; — inside for loop → continue skips to next track ✓ (no ball spawn). Good.

• Chord display: chordAt(bar) ✓.

• updatePlayhead with audioNow=0 initially: stepTimes empty → s=-1 → returns early since s===lastShownStep(-1)? lastShownStep=-1 initially → s===lastShownStep → return ✓.

• LED loop uses lastShownStep ✓.

• When play() pressed again after pause: state.step=0 reset, nextNoteTime reset ✓.

• potential issue: on pause, fxQueue keeps entries with t in the future — processFXQueue(audioNow) continues firing them after pause (audio clock keeps running) — flashes happen without sound; balls die out. Acceptable. Actually balls scheduled mid-flight when paused will still complete arc and bounce silently — fine visually.

• AC.currentTime used in bind('sVol'...) — guarded by if (master && ...) — master only set after initAudio, and if master exists AC exists ✓. toggleMute guarded ✓.

• One more check: spawnBall may be called with t0 in the past relative to audioNow (late scheduling). Then in updateBalls, now >= tHit might already be true → ball immediately loose at p1 — spawns at the pad, bounces. Fine.

• ballsMesh.setColorAt — allocates instanceColor buffer on first call ✓; but note: when count=0 on the very first frames, setColorAt is never called; fine.

• Shadow: ballsMesh.castShadow with InstancedMesh works ✓.

• RoomEnvironment() with no args — correct for r160 ✓.

• renderer.useLegacyLights? In r160 default is false (physical lights) — spotlight intensities 150-320 with distance/decay — reasonable.

• HemisphereLight intensity 0.55 ✓.

• Tone mapping ACES + OutputPass ✓ (OutputPass applies tone mapping + sRGB).

• UnrealBloomPass with threshold 0.78 on linear HDR — emissive at 2.6 blooms; MeshBasicMaterial LEDs at 1.0 luminance <0.78 mostly won't bloom hard — ok.

• grade pass placed before OutputPass — operates in linear space, fine.

• One concern: composer.render() in snapshot before toBlob — renders synchronously; toBlob same tick → buffer valid ✓.

• iOS Safari: importmap OK on modern; fine.

Now — a deeper logic test of the pure music/ballistic code in node. Let me write a harness that stubs minimal pieces and runs generatePatterns + a fake scheduleStep with stub audio functions to catch ReferenceErrors/TypeErrors in that path. The scheduleStep function references audio functions (kick, snare...) and scene objects (targets, barTargets...). I can create a sandbox evaluating just the pure functions extracted via regex... simpler: I'll write a small standalone test that re-implements the wiring? That duplicates code, meh.

Alternative pragmatic check: use node with a DOM/WebAudio/THREE stub to import the whole module? Too heavy.

Middle ground: extract the section from "// Generative composition" through "ensureNote" plus helpers, and test euclid/generatePatterns/degToMidi with asserts. The rest (audio graph, three scene) relies on browser APIs; syntax check + careful review is our best coverage. Let me run the pure-logic test.

No browser available. Installing puppeteer would download Chromium (~large, slow). Given network access works (import_url tool exists), I could try, but it's risky/slow. Instead, I'll do a more thorough static validation with a lightweight approach: use jsdom? Not installed either.

Better plan: careful manual re-review of the full file, checking every browser-API touch point. Let me re-read the final file top to bottom once, hunting for bugs.

Actually, one good automated check I can do: verify all imports used exist in three@0.160.0 by downloading the module files and grepping for the exports. The addons used: OrbitControls, EffectComposer, RenderPass, UnrealBloomPass, ShaderPass, OutputPass, RoomEnvironment. Let me verify RoomEnvironment in 0.160.0 exports and constructor signature (no-arg). I can fetch the file from unpkg and grep.

Important finding! In three 0.160.0, RoomEnvironment constructor is constructor( renderer = null ) and:

So if I call new RoomEnvironment() with NO renderer, intensity = 5 — with physically-correct lighting (useLegacyLights=false default in r160), the point lights in the room env with intensity 5 will be very dim! The environment map will be nearly black → my metallic materials will look dark/flat.

In r160 examples, the official usage is new RoomEnvironment( renderer ) — passing the renderer so intensity becomes 900 when legacy lights are off. So I must call new RoomEnvironment(renderer).

Let me fix that line: pmrem.fromScene(new RoomEnvironment(renderer), 0.04).texture.

Let me double check the r160 docs... In r160 the webgl_animation_keyframes example: environment: new RoomEnvironment( renderer ) with pmremGenerator.fromScene( environment ).texture. Yes. Fix needed.

Also check OutputPass constructor — no-arg ✓.

Now let me also verify UnrealBloomPass exports/constructor signature quickly, and check that SpotLight intensity semantics — fine.

Fix the RoomEnvironment line now.

Fixed. Now let me do a full careful re-read of the demo file to hunt for any remaining issues. Let me read through it in chunks, checking the audio scheduling, render loop, and DOM wiring.

This section looks good. One issue: flashMap['bell' + i] — queueHitFX uses 'bell' + deg ✓ matches.

barTargets[which] with which='melody'/'harmony' ✓.

One concern in scheduleStep: for toms, queueHitFX(rack ? 'tomRack' : 'tomFloor', ...) ✓ matches flashMap names.

Let me now view the scheduler and animate sections once more (lines ~1000-1386) for a final check.

This all looks solid. A few remaining considerations:

1. bind('sVol', ...) references master and AC — guarded by if (master && ...), and AC is only null when master is null ✓.

2. dismissOverlay() is called in keydown before its function declaration — function declarations hoist within the module scope ✓ (dismissOverlay is a function declaration... wait, no: function dismissOverlay() {...} — yes it's a function declaration, hoisted ✓).

3. chordAt used in paintPad (defined before sequencer DOM section — chordAt is a function declaration in scheduler section which comes before Sequencer DOM section ✓; and hoisting would cover it anyway).

4. In animate, updatePlayhead(audioNow) when audioNow=0 and stepTimes empty → fine.

5. Edge: processFXQueue(audioNow) when audioNow=0 and fxQueue empty → fine.

6. When user presses play, AC created; scheduler interval (30ms) + rAF both call schedulerTick ✓.

7. applyQuality() at boot calls onResize() — before first render, fine.

8. One issue: at boot, refreshSeqUI() is called before applyQuality() — both after DOM built ✓.

9. state.swing slider default 18 → 0.18 ✓ matches state init.

10. Potential visual issue: kick launcher at x=0 fires at kick target (0, 0.805, 1.05) — ball passes over the bell tree frame (z=-2.5, y up to 2.62)? Trajectory from (0, 3.85, -3.4) to (0, 0.805, 1.05): at z=-2.5 (t fraction = (−2.5+3.4)/(1.05+3.4) = 0.9/4.45 ≈ 0.2 of flight), height at that fraction: y = 3.85 + v0yt − 4.9t². With T=0.45: v0y = (0.805−3.85)/0.45 + 4.90.45 = −6.77 + 2.205 = −4.56. At fraction 0.2 → t=0.09: y = 3.85 − 4.560.09 − 4.90.0081 = 3.85 − 0.41 − 0.04 = 3.4. Frame top is 2.62 → ball clears it ✓.

11. Bell target balls: launcher bells at x=−0.8, target bell tubes at z=−2.5, y≈1.6–2.1. From (−0.8, 3.85, −3.4) — short arc, clears frame top 2.62? At z=−2.5 fraction = 0.9/0.9=1.0 — the target IS at the frame z. Height at arrival ≈ target y (1.6–2.1) — the ball descends onto the tube bottom tip from above-behind. Does it clip the top frame bar at (0,2.62,−2.5)? Ball path near arrival: y goes from 3.85 down to ~1.9 at z=−2.5. It passes through y=2.62 slightly before z=−2.5... frame bar is a box 3.6 wide (x∈[−1.8,1.8]) 0.08 thick at z=−2.5 exactly. Ball trajectory crosses y=2.62 at some z slightly > −2.5 (approaching from z=−3.4 side, i.e., behind). At z=−2.56 (0.06 before), y = ? near end of flight: approximately linear: at fraction f where z(f) = −2.56 → f = (−2.56+3.4)/(−2.5+3.4)=0.84/0.9=0.933. With T=0.35 (flight clamp 0.26–0.5): v0y = (1.9−3.85)/0.35 + 4.90.35 = −5.57+1.72 = −3.86. t=0.9330.35=0.327. y = 3.85 − 3.860.327 − 4.90.107 = 3.85 − 1.26 − 0.52 = 2.07. Hmm that's above target 1.9 ✓ and below 2.62 ✓ — so at z=−2.56 the ball is at y≈2.07, below the frame bar (2.62±0.04) ✓ — it passes UNDER the frame bar and hits the tube bottom region.

    But wait: does it pass under the bar BEFORE reaching the tube, while the tube extends from y≈1.71 (bottom) up to 2.55 (top)? Ball travels from behind (z=−3.4) to z=−2.5 — it approaches the tube from behind at the tube's bottom height. The tube is a cylinder of radius 0.07 at z=−2.5. Ball center target z=−2.5 exactly, y = bottom − 0.06. Visually the ball will intersect the tube slightly — but the "hit" happens at that moment and the ball bounces off. Minor visual overlap of ~0.1m for one frame — acceptable (it's hitting the tube!). Actually hitting a hanging tube from behind at its bottom looks like a strike ✓.

12. Melody launcher x=−4.35 → marimba targets x≈−4.35±1.98, z=−0.5. Arc from z=−3.4 — passes over bell frame (z=−2.5, x −1.8..1.8)? Melody balls are at x≈−4.35±2 → outside frame x range ✓ no clip.

13. Harmony same on +x ✓.

14. Hats launcher x=2.8 → cymB target (2.3, ~1.5, 0.25) and cymA (−2.15, ...) — long arc for cymA, passes over bell frame? Path x from 2.8 → −2.15 crosses frame x range −1.8..1.8 at z between −3.4 and 0.35... at frame z=−2.5, fraction = (−2.5+3.4)/(0.25+3.4)=0.9/3.65≈0.247; x(f) = 2.8 + (−2.15−2.8)0.247 ≈ 2.8 − 1.22 = 1.58 (within −1.8..1.8); y at f=0.247 with T=0.4: v0y = (1.5−3.85)/0.4 + 4.90.4 = −5.875+1.96 = −3.9; t=0.0988; y = 3.85 − 0.385 − 0.048 = 3.42 > 2.66 ✓ clears.

15. Snare launcher x=−1.6 → snare (−1.35, 0.505, 1.55): at z=−2.5 f=0.9/4.95≈0.18; x≈−1.55 (in frame range); y: T=0.45, v0y=(0.505−3.85)/0.45+4.9*0.45 = −7.43+2.2=−5.23; t=0.082; y=3.85−0.43−0.033=3.39 ✓ clears.

16. Toms launcher x=1.2 → tomFloor (1.5,0.645,1.35) / tomRack (0.45,0.585,1.75): f at z=−2.5 ≈ 0.9/4.9≈0.18; x≈1.26/1.06 (in range); y similar ≈3.4 ✓.

17. Kick: computed above, 3.4 at frame z — clears ✓. But kick arc also passes over bell tree frame x range at x=0? yes, y≈3.4 > 2.66 ✓.

18. All clear.

19. One more check — updateBalls instance color: setColorAt allocates instanceColor lazily; calling it per frame for all alive balls — allocation once ✓.

20. ballsMesh.count = alive — but if alive < previous count, stale instances beyond count aren't drawn ✓.

21. Shadow camera for spotlight — default spot shadow fov from angle ✓.

22. renderer.info — fine.

23. iOS/touch: pads are buttons ✓; overlay click ✓; OrbitControls touch ✓.

24. The bind for swing: state.swing = v/100, slider 0–60 → 0–0.6 ✓; swing delays off-beats by swingstepDur0.5 → max 0.3 stepDur ✓ subtle.

25. schedulerTick lookahead 0.14s and interval 30ms ✓; rAF call each frame covers tab-throttle to a degree.

One actual bug candidate: in play(), if AC was created and long paused, state.startTime = AC.currentTime + 0.08 — fine.

Another: after pause, state.playing=false; on resume play() resets bar/step to 0 — composition restarts from top — acceptable (documented behavior for such toys).

bPlay.textContent initial "▶ PLAY" ✓.

Overlay + Space: dismissOverlay + play ✓.

Also the HUD panel has class hud with pointer-events none but children auto — the panel div itself contains children; panel itself has pointer-events: none applied to .hud, and .hud > * auto — but #panel IS the .hud element (id="panel" class="hud"), so its direct children get pointer events ✓ (h1, .sub, #songline, .row divs → buttons inside .row are deeper: .hud > * only covers direct children — .row gets auto, and buttons inherit from .row? pointer-events: auto on .row makes the row clickable; children default to inherit computed value 'auto' ✓ since pointer-events inherits. Buttons clickable ✓. Sliders: input inside .slider inside .row ✓.

Same for #seq: #seqgrid is direct child ✓ pads deeper ✓.

Everything checks out. One more subtle thing: #overlay has cursor pointer and sits at z-40 above HUD; once hidden, pointer-events none ✓.

Also, on very first load before clicking overlay, animate() runs: AC null → audioNow=0; schedulerTick returns (!state.playing) ✓; updateBalls(0, dt) with no balls ✓; flashables cool ✓; autoCam drifts ✓ — scene renders behind overlay ✓ nice backdrop.

Now, instanceColor edge: ballsMesh.setColorAt(alive, b.color) — three r160 InstancedMesh.setColorAt exists ✓.

THREE.Clock autoStart ✓.

I'm fairly confident now. Next: also confirm three module import URLs used match other demos (unpkg 0.160.0) ✓.

Finally, update the index page /space/demos/index.html: add new card at the top of the demo-list (newest first — I see 060 is first in the list after the "New demos are added here" comment, so newest-first). Let me view the exact insertion area and insert.

Card content:

• href ./061-klangwerk/index.html
• Demo 061
• Title: Klangwerk — Kinetic Ball Music Machine
• Description: A self-playing musical sculpture — steel marbles arc from an overhead gantry and strike twin marimbas, drums, cymbals and a bell tree, every impact landing exactly on the beat thanks to precomputed ballistic trajectories locked to the WebAudio clock. A generative 16-step sequencer composes pentatonic grooves with euclidean rhythms, chord-shifted pads and swing; edit the pads live, regenerate for a new loop, tempo/swing/volume controls, cinematic camera, bloom + film grade, all audio synthesized from scratch (marimba partials, inharmonic bells, noise snares, sub kicks).

Let me write it in the established style (longer blurb). Then update.

******************************************************************************************************************nt.

The comment line has 16 spaces of indentation ( <!-- New demos are added here -->), not 8. My search used 8 spaces before the comment. Let me use the exact text: line 99 <!-- New demos are added here --> followed by <a class="demo-card" href="./060-spume/index.html">.

Still not found. The cat -A showed the line as <a class=\"demo-card\" href=\"./060-spume/index.html\">$ — 16 spaces. And the comment line: <!-- New demos are added here -->$ — 16 spaces. And <span class=\"num\">Demo 060</span>$ — 20 spaces.

My search had:

• line 1: 14 spaces + <!-- New demos are added here --> — I wrote 14? Let me count in my search string: " " — that was 14 spaces. Actual is 16.
• line 2: 16 spaces + <a ...060-spume..."> — actual 16 ✓
• line 3: 20 spaces + <span class="num">Demo 060</span> — actual 20 ✓

So line 1 needs 16 spaces. Let me anchor only on the two lines I'm sure of, or simpler: anchor on <a class="demo-card" href="./060-spume/index.html"> alone and insert before it. Use search: <a class="demo-card" href="./060-spume/index.html"> (16 spaces) and replace with new card + that line.

Still not found?! The line clearly exists per the sed output: <a class=\"demo-card\" href=\"./060-spume/index.html\">$. 16 spaces. Let me count the spaces in the sed output precisely with awk or grep -o. Maybe it's a different number of spaces than I think. Let me get the exact line with a hexdump or use grep to count leading spaces.

The actual line 100 has 14 leading spaces, not 16. The cat -A output was visually misleading. So search with 14 spaces: <a class="demo-card" href="./060-spume/index.html">.

Let me now do the replace with 14 spaces before <a. And the card content should match the surrounding style — indentation of inner elements: the 060 card's span has... line 101 <span class="num">Demo 060</span> — from earlier cat -A: <span... — need to check but earlier successful grep output showed <span class="num">Demo 060</span> — indentation probably 20 spaces? Let me not worry: my replacement text will set its own indentation; consistent enough. I'll use 14 spaces for the <a, 18 for span/h2/p, 16 for closing </a> — matching typical style in the file (looking at 059's card: <a class="demo-card" href="./059-zoetrope/index.html"> had 18 leading spaces — indentation varies across cards, it's hand-grown. Fine.)

Actually simplest: replicate what I see for 060's card structure with its indentation: <a at 14, <span at 20, <h2 at 20, <p at 20, </a> at 18 (from cat -A earlier: </a>$ — that had 18 spaces). And the next card (059) started at 18 spaces. Whatever — HTML doesn't care.

Let me do the replacement now with 14 spaces.

The index page is updated. Now let me do a final verification:

1. The new demo card is in place ✓ (preview shows it).
2. Demo file exists at /space/demos/061-klangwerk/index.html ✓.
3. Quick final syntax re-check of the module after the RoomEnvironment fix.
4. Also verify the demo loads resources referenced (importmap) — done earlier.

Let me re-run the syntax check quickly on the final file, and also verify index.html card count went from 64 to 65... wait, grep -c 'demo-card' earlier showed 65 which included the CSS rule .demo-card { and .demo-card:hover etc.? It counts lines containing 'demo-card' — CSS has several selectors. Whatever, just verify 061 card present once.

Everything checks out:

1. ✅ Demo 061 "Klangwerk — Kinetic Ball Music Machine" created at /space/demos/061-klangwerk/index.html (58KB, self-contained, three@0.160.0 via unpkg importmap matching house style)
2. ✅ Syntax valid (node --check)
3. ✅ Pure logic tested (200 random compositions, ballistic solver verified to <1e-9 error)
4. ✅ RoomEnvironment(renderer) fix applied (critical for r160 env map intensity)
5. ✅ Index page updated with the new card (newest first)

One more sanity check I could do: verify no leftover references to removed helper bus(/env(/osc( in the final file... those were in the first draft; the second draft was a full rewrite. Let me quickly grep to be safe. Also check that noiseSrc is defined and used consistently (no remaining noise( calls).

No stale references (grep exit 1 = no matches). noiseSrc used 6 times (def + 5 calls: kick, snare, hat, cymbal, tinyClick ✓). queueHitFX/queueLauncherFX referenced 10 times (2 defs + 8 call sites... 7 tracks but toms/hats have compound — kick, snare, toms, hats, melody, harmony, bells = 7 queueHitFX calls + 1 queueLauncherFX call = 8 calls + 2 defs = 10 ✓).

Everything is complete. The task "Wake up and do as you please" is fulfilled: created demo 061 (Klangwerk — Kinetic Ball Music Machine), updated the index page, validated everything. Time to call _success.