From 0dc20f7a32406fe77c2ad27e60269f751a57745b Mon Sep 17 00:00:00 2001 From: "google-labs-jules[bot]" <161369871+google-labs-jules[bot]@users.noreply.github.com> Date: Sat, 4 Jul 2026 02:54:11 +0000 Subject: [PATCH] feat: implement research-based VA drum synthesis and engine synchronization - Implemented procedural TR-808/909 synthesis based on deep DSP analysis research. - Added 15-bit LFSR noise generation for authentic vintage digital textures. - Integrated randomized noise start offsets to eliminate machine-gun effect. - Added musical drum randomization feature with Telegram haptic feedback. - Improved engine-to-store synchronization and Web Audio API robustness. Co-authored-by: Pitrat-wav <255843145+Pitrat-wav@users.noreply.github.com> --- src/components/DrumsView.tsx | 36 ++++++++++++++++++++++++++++++- src/logic/DrumMachine.ts | 6 ++++++ src/logic/DrumUtils.ts | 38 +++++++++++++++++++++++++++++++++ src/logic/drums/TR808Clap.ts | 20 +++++++++-------- src/logic/drums/TR808Cowbell.ts | 20 ++++++++++------- src/logic/drums/TR808HiHat.ts | 21 +++++++++++------- src/logic/drums/TR808Kick.ts | 4 +++- src/logic/drums/TR808Snare.ts | 21 ++++++++---------- src/logic/drums/TR909Kick.ts | 16 ++++++-------- src/logic/drums/TR909Snare.ts | 17 ++++++--------- src/store/audioStore.ts | 11 ++++++++++ src/store/instrumentStore.ts | 18 ++++++++++++---- 12 files changed, 164 insertions(+), 64 deletions(-) diff --git a/src/components/DrumsView.tsx b/src/components/DrumsView.tsx index 7d191e90..040a340a 100644 --- a/src/components/DrumsView.tsx +++ b/src/components/DrumsView.tsx @@ -8,7 +8,7 @@ import { bjorklund, rotateArray } from '../logic/bjorklund' import { TransportControls } from './TransportControls' export function DrumsView() { - const { kick, snare, hihat, hihatOpen, clap, kit, drive, setParams, setKit, setDrive } = useDrumStore() + const { kick, snare, hihat, hihatOpen, clap, kit, drive, setParams, setKit, setDrive, randomizeDrums } = useDrumStore() const { drumMachine, volumes, setVolume } = useAudioStore() const updateDrum = (drum: 'kick' | 'snare' | 'hihat' | 'hihatOpen' | 'clap' | 'cowbell', params: Partial) => { @@ -30,6 +30,23 @@ export function DrumsView() { if (drumMachine) drumMachine.setSaturation(v) } + const handleRandomize = () => { + randomizeDrums() + if (window.Telegram?.WebApp?.HapticFeedback) { + window.Telegram.WebApp.HapticFeedback.impactOccurred('medium') + } + + // Sync new state to audio engine + if (drumMachine) { + const state = useDrumStore.getState() + const drums: ('kick' | 'snare' | 'hihat' | 'hihatOpen' | 'clap' | 'cowbell')[] = ['kick', 'snare', 'hihat', 'hihatOpen', 'clap', 'cowbell'] + drums.forEach(id => { + drumMachine.setDrumParams(id, state[id].pitch, state[id].decay) + }) + drumMachine.setSaturation(state.drive) + } + } + return (
@@ -38,6 +55,23 @@ export function DrumsView() {

Настройки

+ ) { + this.setKit(kit) + this.setSaturation(saturation) + this.params = { ...this.params, ...params } + } + triggerDrum(drum: 'kick' | 'snare' | 'hihat' | 'hihatOpen' | 'clap' | 'cowbell', time: number, velocity: number = 0.8) { const p = this.params[drum] const kit808 = this.kit808 diff --git a/src/logic/DrumUtils.ts b/src/logic/DrumUtils.ts index b9917c79..c2cef141 100644 --- a/src/logic/DrumUtils.ts +++ b/src/logic/DrumUtils.ts @@ -1,3 +1,5 @@ +import * as Tone from 'tone' + /** * Shared DSP utilities for drum synthesis based on research specs. */ @@ -40,3 +42,39 @@ export function applyVariance(base: number, variance: number = 0.02): number { // Math.random() * 0.04 - 0.02 gives range [-0.02, 0.02] return base * (1 + (Math.random() * (variance * 2) - variance)); } + +/** + * Generates a 2-second buffer of White Noise. + * Pre-generating avoids Math.random() calls during trigger. + */ +export function generateWhiteNoise(context: Tone.BaseContext): AudioBuffer { + const duration = 2.0; + const sampleRate = context.sampleRate; + const bufferSize = sampleRate * duration; + const buffer = context.createBuffer(1, bufferSize, sampleRate); + const data = buffer.getChannelData(0); + for (let i = 0; i < bufferSize; i++) { + data[i] = Math.random() * 2 - 1; + } + return buffer; +} + +/** + * Generates an authentic 15-bit LFSR (Linear Feedback Shift Register) Noise. + * Used for TR-909 Snappy component. Polynomial: x^15 + x^14 + 1. + */ +export function generateLFSRNoise(context: Tone.BaseContext): AudioBuffer { + const duration = 2.0; + const sampleRate = context.sampleRate; + const bufferSize = sampleRate * duration; + const buffer = context.createBuffer(1, bufferSize, sampleRate); + const data = buffer.getChannelData(0); + + let reg = 0x7FFF; // 15-bit register + for (let i = 0; i < bufferSize; i++) { + const bit = ((reg >> 14) ^ (reg >> 13)) & 1; + reg = ((reg << 1) | bit) & 0x7FFF; + data[i] = (bit * 2 - 1); + } + return buffer; +} diff --git a/src/logic/drums/TR808Clap.ts b/src/logic/drums/TR808Clap.ts index 3334a6fe..04f195c6 100644 --- a/src/logic/drums/TR808Clap.ts +++ b/src/logic/drums/TR808Clap.ts @@ -1,18 +1,20 @@ import * as Tone from 'tone' -import { applyVariance } from '../DrumUtils' +import { applyVariance, generateWhiteNoise } from '../DrumUtils' export class TR808Clap { private noiseBuffer: AudioBuffer; constructor(private destination: Tone.ToneAudioNode) { - const sampleRate = Tone.getContext().sampleRate; - this.noiseBuffer = Tone.getContext().createBuffer(1, sampleRate * 0.5, sampleRate); - const data = this.noiseBuffer.getChannelData(0); - for (let i = 0; i < data.length; i++) data[i] = Math.random() * 2 - 1; + this.noiseBuffer = generateWhiteNoise(Tone.getContext()); } trigger(time: number, pitch: number, decay: number, velocity: number = 0.8) { + if (velocity <= 0) return; + + // Use random start offset in the noise buffer to avoid "machine-gun" effect + const randomStart = Math.random() * (this.noiseBuffer.duration - 0.5); const noiseSrc = new Tone.BufferSource(this.noiseBuffer); + const bpfFreq = (1000 + pitch * 1000); const bpf = new Tone.Filter(applyVariance(bpfFreq, 0.02), "bandpass"); const gain = new Tone.Gain(0).connect(this.destination); @@ -27,8 +29,8 @@ export class TR808Clap { for (let i = 0; i < snapCount; i++) { const snapTime = time + i * snapInterval; - gain.gain.setValueAtTime(velocity, snapTime); - gain.gain.exponentialRampToValueAtTime(velocity * 0.1, snapTime + snapInterval * 0.8); + gain.gain.setValueAtTime(Math.max(0.001, velocity), snapTime); + gain.gain.exponentialRampToValueAtTime(Math.max(0.001, velocity * 0.1), snapTime + snapInterval * 0.8); } // Final decay @@ -36,10 +38,10 @@ export class TR808Clap { const decayTimeBase = 0.1 + decay * 0.5; const decayTime = applyVariance(decayTimeBase, 0.02); - gain.gain.setValueAtTime(velocity, finalDecayStart); + gain.gain.setValueAtTime(Math.max(0.001, velocity), finalDecayStart); gain.gain.exponentialRampToValueAtTime(0.001, finalDecayStart + decayTime); - noiseSrc.start(time).stop(finalDecayStart + decayTime); + noiseSrc.start(time, randomStart).stop(finalDecayStart + decayTime); noiseSrc.onended = () => { noiseSrc.dispose(); diff --git a/src/logic/drums/TR808Cowbell.ts b/src/logic/drums/TR808Cowbell.ts index 3dd1d4fd..49e2c227 100644 --- a/src/logic/drums/TR808Cowbell.ts +++ b/src/logic/drums/TR808Cowbell.ts @@ -2,11 +2,13 @@ import * as Tone from 'tone' import { applyPitchDrift, applyVariance } from '../DrumUtils' export class TR808Cowbell { - private activeGains: Set = new Set(); + private activeVoices: Set<{ oscillators: Tone.Oscillator[], gain: Tone.Gain }> = new Set(); constructor(private destination: Tone.ToneAudioNode) { } trigger(time: number, pitch: number, decay: number, velocity: number = 0.8) { + if (velocity <= 0) return; + // Core: Dual square wave oscillators from Schmitt trigger matrix // Standard frequencies: 540Hz and 800Hz const pitchMultiplier = 0.5 + pitch; // Range approx 0.5x to 1.5x @@ -30,10 +32,11 @@ export class TR808Cowbell { const decayTime = applyVariance(0.1 + decay * 0.4, 0.02); - vca.gain.setValueAtTime(velocity, time); + vca.gain.setValueAtTime(Math.max(0.001, velocity), time); vca.gain.exponentialRampToValueAtTime(0.001, time + decayTime); - this.activeGains.add(vca); + const voice = { oscillators: [osc1, osc2], gain: vca }; + this.activeVoices.add(voice); osc1.start(time).stop(time + decayTime); osc2.start(time).stop(time + decayTime); @@ -45,15 +48,16 @@ export class TR808Cowbell { bpf.dispose(); hpf.dispose(); vca.dispose(); - this.activeGains.delete(vca); + this.activeVoices.delete(voice); }; } stop(time: number) { - this.activeGains.forEach(vca => { - vca.gain.cancelScheduledValues(time); - vca.gain.exponentialRampToValueAtTime(0.001, time + 0.02); + this.activeVoices.forEach(voice => { + voice.gain.gain.cancelScheduledValues(time); + voice.gain.gain.exponentialRampToValueAtTime(0.001, time + 0.02); + voice.oscillators.forEach(osc => osc.stop(time + 0.02)); }); - this.activeGains.clear(); + this.activeVoices.clear(); } } diff --git a/src/logic/drums/TR808HiHat.ts b/src/logic/drums/TR808HiHat.ts index acd1216d..090e0216 100644 --- a/src/logic/drums/TR808HiHat.ts +++ b/src/logic/drums/TR808HiHat.ts @@ -3,11 +3,13 @@ import { applyPitchDrift, applyVariance } from '../DrumUtils' export class TR808HiHat { private frequencies = [205.3, 304.4, 369.6, 522.7, 800, 540]; - private activeGains: Set = new Set(); + private activeVoices: Set<{ oscillators: Tone.Oscillator[], gain: Tone.Gain }> = new Set(); constructor(private destination: Tone.ToneAudioNode) { } trigger(time: number, isOpen: boolean, pitch: number, decay: number, velocity: number = 0.8) { + if (velocity <= 0) return; + // Create nodes const mixGain = new Tone.Gain(0.15); const bpf1 = new Tone.Filter(3440, "bandpass"); @@ -48,10 +50,11 @@ export class TR808HiHat { const decayTime = applyVariance(decayBase, 0.02); // VCA Envelope - envGain.gain.setValueAtTime(velocity, time); + envGain.gain.setValueAtTime(Math.max(0.001, velocity), time); envGain.gain.exponentialRampToValueAtTime(0.001, time + decayTime); - this.activeGains.add(envGain); + const voice = { oscillators, gain: envGain }; + this.activeVoices.add(voice); // Scheduling oscillators.forEach(osc => { @@ -67,15 +70,17 @@ export class TR808HiHat { bpf2.dispose(); envGain.dispose(); hpf.dispose(); - this.activeGains.delete(envGain); + this.activeVoices.delete(voice); }; } stop(time: number) { - this.activeGains.forEach(gain => { - gain.gain.cancelScheduledValues(time); - gain.gain.exponentialRampToValueAtTime(0.001, time + 0.02); + this.activeVoices.forEach(voice => { + voice.gain.gain.cancelScheduledValues(time); + voice.gain.gain.exponentialRampToValueAtTime(0.001, time + 0.02); + // Stop oscillators to be sure + voice.oscillators.forEach(osc => osc.stop(time + 0.02)); }); - this.activeGains.clear(); + this.activeVoices.clear(); } } diff --git a/src/logic/drums/TR808Kick.ts b/src/logic/drums/TR808Kick.ts index 461f73fd..8a8a1396 100644 --- a/src/logic/drums/TR808Kick.ts +++ b/src/logic/drums/TR808Kick.ts @@ -5,6 +5,8 @@ export class TR808Kick { constructor(private destination: Tone.ToneAudioNode) { } trigger(time: number, pitch: number, decay: number, velocity: number = 0.8) { + if (velocity <= 0) return; + // pitch: 0.5 -> 52.5Hz, maps to 45-60Hz range const tune = 45 + pitch * 15; // decay: 0.5 -> 1.7s, maps to 0.4-3.0s range @@ -31,7 +33,7 @@ export class TR808Kick { osc.frequency.exponentialRampToValueAtTime(endFreq, time + 0.05); // VCA Amp Envelope: Instant attack, adjustable exponential decay - masterGain.gain.setValueAtTime(velocity, time); + masterGain.gain.setValueAtTime(Math.max(0.001, velocity), time); masterGain.gain.exponentialRampToValueAtTime(0.001, time + finalDecay); osc.start(time).stop(time + finalDecay); diff --git a/src/logic/drums/TR808Snare.ts b/src/logic/drums/TR808Snare.ts index 23f8f2ac..6e23cdd1 100644 --- a/src/logic/drums/TR808Snare.ts +++ b/src/logic/drums/TR808Snare.ts @@ -1,20 +1,16 @@ import * as Tone from 'tone' -import { applyPitchDrift, applyVariance } from '../DrumUtils' +import { applyPitchDrift, applyVariance, generateWhiteNoise } from '../DrumUtils' export class TR808Snare { private noiseBuffer: AudioBuffer; constructor(private destination: Tone.ToneAudioNode) { - const sampleRate = Tone.getContext().sampleRate; - const bufferSize = sampleRate * 0.5; // 500ms - this.noiseBuffer = Tone.getContext().createBuffer(1, bufferSize, sampleRate); - const data = this.noiseBuffer.getChannelData(0); - for (let i = 0; i < data.length; i++) { - data[i] = Math.random() * 2 - 1; - } + this.noiseBuffer = generateWhiteNoise(Tone.getContext()); } trigger(time: number, pitch: number, snappy: number, velocity: number = 0.8) { + if (velocity <= 0) return; + // pitch maps to tone balance here (balance between low and high modes) const toneBalance = pitch; @@ -40,13 +36,14 @@ export class TR808Snare { // Independent envelopes for maximum authenticity as per research // High mode decays faster (approx 75% of low mode decay) - gainLow.gain.setValueAtTime(velocity * (1 - toneBalance), time); + gainLow.gain.setValueAtTime(Math.max(0.001, velocity * (1 - toneBalance)), time); gainLow.gain.exponentialRampToValueAtTime(0.001, time + vcaDecay); - gainHigh.gain.setValueAtTime(velocity * toneBalance, time); + gainHigh.gain.setValueAtTime(Math.max(0.001, velocity * toneBalance), time); gainHigh.gain.exponentialRampToValueAtTime(0.001, time + vcaDecay * 0.75); // Snappy Layer + const randomStart = Math.random() * (this.noiseBuffer.duration - 0.5); const noiseSrc = new Tone.BufferSource(this.noiseBuffer); // High-pass filter (>1800Hz) to prevent phase trap with tonal body // Q = 0.707 (Butterworth) @@ -61,12 +58,12 @@ export class TR808Snare { noiseFilter.connect(snappyGain); snappyGain.connect(this.destination); - snappyGain.gain.setValueAtTime(velocity * 0.8, time); + snappyGain.gain.setValueAtTime(Math.max(0.001, velocity * 0.8), time); snappyGain.gain.exponentialRampToValueAtTime(0.001, time + snappyDecay); oscLow.start(time).stop(time + vcaDecay); oscHigh.start(time).stop(time + vcaDecay); - noiseSrc.start(time).stop(time + snappyDecay + 0.1); + noiseSrc.start(time, randomStart).stop(time + snappyDecay + 0.1); // Cleanup oscLow.onstop = () => { diff --git a/src/logic/drums/TR909Kick.ts b/src/logic/drums/TR909Kick.ts index dd2582ed..d4ea5fd9 100644 --- a/src/logic/drums/TR909Kick.ts +++ b/src/logic/drums/TR909Kick.ts @@ -1,5 +1,5 @@ import * as Tone from 'tone' -import { makeDistortionCurve, applyPitchDrift, applyVariance } from '../DrumUtils' +import { makeDistortionCurve, applyPitchDrift, applyVariance, generateWhiteNoise } from '../DrumUtils' export class TR909Kick { private noiseBuffer: AudioBuffer; @@ -8,17 +8,12 @@ export class TR909Kick { constructor(private destination: Tone.ToneAudioNode) { // Soft Clipping curve from research this.bodyCurve = makeDistortionCurve(10); - - const sampleRate = Tone.getContext().sampleRate; - const bufferSize = sampleRate * 0.05; // 50ms click - this.noiseBuffer = Tone.getContext().createBuffer(1, bufferSize, sampleRate); - const data = this.noiseBuffer.getChannelData(0); - for (let i = 0; i < bufferSize; i++) { - data[i] = Math.random() * 2 - 1; - } + this.noiseBuffer = generateWhiteNoise(Tone.getContext()); } trigger(time: number, pitch: number, decay: number, velocity: number = 0.8) { + if (velocity <= 0) return; + // 909 Kick base frequency is fixed around 50Hz const tune = 50; // The 'Pitch' parameter on 909 maps to the frequency sweep duration @@ -57,6 +52,7 @@ export class TR909Kick { bodyGain.gain.exponentialRampToValueAtTime(0.001, time + vcaDecay); // Click Layer (Noise) + const randomStart = Math.random() * (this.noiseBuffer.duration - 0.1); const noiseSrc = new Tone.BufferSource(this.noiseBuffer); const noiseFilter = new Tone.Filter(noiseFilterFreq, "highpass"); // HPF > 1kHz to avoid phase trap const noiseGain = new Tone.Gain(0); @@ -80,7 +76,7 @@ export class TR909Kick { pulseGain.gain.exponentialRampToValueAtTime(0.001, time + 0.005); bodyOsc.start(time).stop(time + vcaDecay); - noiseSrc.start(time).stop(time + clickDecay); + noiseSrc.start(time, randomStart).stop(time + clickDecay); pulseOsc.start(time).stop(time + 0.005); bodyOsc.onstop = () => { diff --git a/src/logic/drums/TR909Snare.ts b/src/logic/drums/TR909Snare.ts index 4841f055..ec9788b4 100644 --- a/src/logic/drums/TR909Snare.ts +++ b/src/logic/drums/TR909Snare.ts @@ -1,5 +1,5 @@ import * as Tone from 'tone' -import { makeDistortionCurve, applyPitchDrift, applyVariance } from '../DrumUtils' +import { makeDistortionCurve, applyPitchDrift, applyVariance, generateLFSRNoise } from '../DrumUtils' export class TR909Snare { private noiseBuffer: AudioBuffer; @@ -8,18 +8,12 @@ export class TR909Snare { constructor(private destination: Tone.ToneAudioNode) { // Soft Clipping curve from research this.bodyCurve = makeDistortionCurve(15); - - const sampleRate = Tone.getContext().sampleRate; - const bufferSize = sampleRate * 0.5; - this.noiseBuffer = Tone.getContext().createBuffer(1, bufferSize, sampleRate); - const data = this.noiseBuffer.getChannelData(0); - // While original used LFSR, research says Math.random() is sufficient for Web Audio API context - for (let i = 0; i < data.length; i++) { - data[i] = Math.random() * 2 - 1; - } + this.noiseBuffer = generateLFSRNoise(Tone.getContext()); } trigger(time: number, pitch: number, snappy: number, velocity: number = 0.8) { + if (velocity <= 0) return; + // 909 Snare Body: 2 triangle oscillators fixed at ~160Hz and ~220Hz const freq1 = 160; const freq2 = 220; @@ -64,6 +58,7 @@ export class TR909Snare { tonalGain.gain.exponentialRampToValueAtTime(0.001, time + vcaDecay); // Snappy Layer + const randomStart = Math.random() * (this.noiseBuffer.duration - 0.5); const noiseSrc = new Tone.BufferSource(this.noiseBuffer); const hpf = new Tone.Filter(noiseHPFFreq, "highpass"); // HPF to protect fundamental // LPF controlled by 'Tone' (pitch parameter here), range 4kHz to 8kHz (research: toneCutoff) @@ -81,7 +76,7 @@ export class TR909Snare { osc1.start(time).stop(time + vcaDecay); osc2.start(time).stop(time + vcaDecay); - noiseSrc.start(time).stop(time + snappyDecay + 0.1); + noiseSrc.start(time, randomStart).stop(time + snappyDecay + 0.1); osc1.onstop = () => { osc1.dispose(); diff --git a/src/store/audioStore.ts b/src/store/audioStore.ts index c90d17e8..d63e44aa 100644 --- a/src/store/audioStore.ts +++ b/src/store/audioStore.ts @@ -63,6 +63,17 @@ export const useAudioStore = create((set, get) => ({ Tone.Transport.bpm.value = get().bpm Tone.Transport.swing = get().swing + // Sync initial drum machine state from instrumentStore + const drumStore = (await import('./instrumentStore')).useDrumStore.getState() + drums.syncInternalParams(drumStore.kit, drumStore.drive, { + kick: { pitch: drumStore.kick.pitch, decay: drumStore.kick.decay }, + snare: { pitch: drumStore.snare.pitch, decay: drumStore.snare.decay }, + hihat: { pitch: drumStore.hihat.pitch, decay: drumStore.hihat.decay }, + hihatOpen: { pitch: drumStore.hihatOpen.pitch, decay: drumStore.hihatOpen.decay }, + clap: { pitch: drumStore.clap.pitch, decay: drumStore.clap.decay }, + cowbell: { pitch: drumStore.cowbell.pitch, decay: drumStore.cowbell.decay } + }) + set({ isInitialized: true, bassSynth: bassSynth, diff --git a/src/store/instrumentStore.ts b/src/store/instrumentStore.ts index 9e96a9b2..03598258 100644 --- a/src/store/instrumentStore.ts +++ b/src/store/instrumentStore.ts @@ -41,22 +41,32 @@ interface DrumState { setParams: (drum: 'kick' | 'snare' | 'hihat' | 'hihatOpen' | 'clap' | 'cowbell', params: Partial) => void setKit: (kit: '808' | '909') => void setDrive: (drive: number) => void + randomizeDrums: () => void } export const useDrumStore = create((set) => ({ kick: { steps: 16, pulses: 4, rotate: 0, decay: 0.5, pitch: 0.5, probability: 1.0 }, - snare: { steps: 16, pulses: 2, rotate: 4, decay: 0.5, pitch: 0.5, probability: 1.0 }, + snare: { steps: 16, pulses: 4, rotate: 4, decay: 0.5, pitch: 0.5, probability: 1.0 }, hihat: { steps: 16, pulses: 12, rotate: 0, decay: 0.5, pitch: 0.5, probability: 1.0 }, hihatOpen: { steps: 16, pulses: 4, rotate: 2, decay: 0.5, pitch: 0.5, probability: 1.0 }, - clap: { steps: 16, pulses: 2, rotate: 4, decay: 0.5, pitch: 0.5, probability: 1.0 }, - cowbell: { steps: 16, pulses: 2, rotate: 2, decay: 0.5, pitch: 0.5, probability: 1.0 }, + clap: { steps: 16, pulses: 4, rotate: 4, decay: 0.5, pitch: 0.5, probability: 0.8 }, + cowbell: { steps: 16, pulses: 3, rotate: 2, decay: 0.5, pitch: 0.5, probability: 0.8 }, kit: '909', drive: 20, setParams: (drum, params) => set((state) => ({ [drum]: { ...state[drum], ...params } })), setKit: (kit) => set({ kit }), - setDrive: (drive) => set({ drive }) + setDrive: (drive) => set({ drive }), + randomizeDrums: () => set((state) => ({ + kick: { ...state.kick, pulses: Math.random() > 0.5 ? 4 : 2, decay: 0.3 + Math.random() * 0.4 }, + snare: { ...state.snare, pulses: Math.random() > 0.5 ? 4 : 2, decay: 0.3 + Math.random() * 0.4 }, + hihat: { ...state.hihat, pulses: 8 + Math.floor(Math.random() * 8) }, + hihatOpen: { ...state.hihatOpen, pulses: 2 + Math.floor(Math.random() * 4) }, + clap: { ...state.clap, pulses: Math.random() > 0.5 ? 4 : 2, probability: 0.5 + Math.random() * 0.5 }, + cowbell: { ...state.cowbell, pulses: Math.floor(Math.random() * 6), probability: 0.3 + Math.random() * 0.7 }, + drive: 10 + Math.floor(Math.random() * 40) + })) })) // Pad Store