Pitrat-wav · Pitrat-wav · Jun 17, 2026
diff --git a/src/components/DrumsView.tsx b/src/components/DrumsView.tsx
@@ -30,13 +30,45 @@ export function DrumsView() {
         if (drumMachine) drumMachine.setSaturation(v)
     }
 
+    const randomizeTechno = () => {
+        // Haptic Feedback for randomization
+        if (window.Telegram?.WebApp?.HapticFeedback) {
+            window.Telegram.WebApp.HapticFeedback.impactOccurred('medium')
+        }
+
+        // Apply Techno Foundation defaults
+        updateDrum('kick', { steps: 16, pulses: 4, rotate: 0, probability: 1.0 })
+        updateDrum('snare', { steps: 16, pulses: 4, rotate: 4, probability: 1.0 })
+        updateDrum('hihat', { steps: 16, pulses: 12, rotate: 0, probability: 1.0 })
+        updateDrum('hihatOpen', { steps: 16, pulses: 4, rotate: 2, probability: 1.0 })
+        updateDrum('clap', { steps: 16, pulses: 2, rotate: 4, probability: 1.0 })
+        updateDrum('cowbell', { steps: 16, pulses: 3, rotate: 2, probability: 0.8 })
+    }
+
     return (
         <div style={{ display: 'flex', flexDirection: 'column', gap: '24px' }}>
             <TransportControls title="Драм-машина" />
 
             <section className="card">
                 <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
-                    <h3 style={{ margin: 0 }}>Настройки</h3>
+                    <div style={{ display: 'flex', alignItems: 'center', gap: '8px' }}>
+                        <h3 style={{ margin: 0 }}>Настройки</h3>
+                        <button
+                            onClick={randomizeTechno}
+                            style={{
+                                background: 'rgba(0,0,0,0.05)',
+                                border: 'none',
+                                padding: '6px',
+                                borderRadius: '8px',
+                                display: 'flex',
+                                alignItems: 'center',
+                                cursor: 'pointer'
+                            }}
+                            title="Randomize Techno"
+                        >
+                            <Dices size={16} color="var(--tg-theme-button-color)" />
+                        </button>
+                    </div>
                     <div style={{ display: 'flex', gap: '12px', alignItems: 'center' }}>
                         <Knob
                             label="DRIVE"
@@ -105,9 +137,9 @@ export function DrumsView() {
                             />
                             <Knob
                                 label="Vol"
-                                value={volumes[d.id === 'cowbell' ? 'cow' : d.id]}
+                                value={volumes[d.id === 'cowbell' ? 'cowbell' : d.id]}
                                 min={0} max={1} step={0.01}
-                                onChange={(v) => setVolume(d.id === 'cowbell' ? 'cow' : d.id, v)}
+                                onChange={(v) => setVolume(d.id === 'cowbell' ? 'cowbell' : d.id, v)}
                                 size={40}
                             />
                         </div>

diff --git a/src/components/MixerView.tsx b/src/components/MixerView.tsx
@@ -58,10 +58,10 @@ export function MixerView() {
                     size={48}
                 />
                 <Knob
-                    label="Cow"
-                    value={volumes.cow}
+                    label="Cowbell"
+                    value={volumes.cowbell}
                     min={0} max={1} step={0.01}
-                    onChange={(v) => setVolume('cow', v)}
+                    onChange={(v) => setVolume('cowbell', v)}
                     size={48}
                 />
                 <Knob

diff --git a/src/components/SequencerLoop.tsx b/src/components/SequencerLoop.tsx
@@ -79,6 +79,10 @@ export function SequencerLoop() {
                 }
             }
 
+            if (step === 0 && window.Telegram?.WebApp?.HapticFeedback) {
+                window.Telegram.WebApp.HapticFeedback.impactOccurred('light')
+            }
+
             triggerDrumWithProb('kick')
             triggerDrumWithProb('snare')
             triggerDrumWithProb('hihat')

diff --git a/src/logic/DrumUtils.ts b/src/logic/DrumUtils.ts
@@ -22,12 +22,14 @@ export function makeDistortionCurve(amount: number = 20): Float32Array {
 
 /**
  * Applies micro-randomization to a base frequency (Pitch Drift).
- * Typically +/- 1Hz as per research.
+ * Uses cent-based logarithmic frequency deviation.
+ * Formula: f_new = f_base * Math.pow(2, cents / 1200)
  * @param base - Base frequency in Hz
- * @param range - Drift range in Hz (default 1.0)
+ * @param cents - Drift range in cents (default +/- 1 cent)
  */
-export function applyPitchDrift(base: number, range: number = 1.0): number {
-    return base + (Math.random() * 2 - 1) * range;
+export function applyPitchDrift(base: number, cents: number = 1.0): number {
+    const drift = (Math.random() * 2 - 1) * cents;
+    return base * Math.pow(2, drift / 1200);
 }
 
 /**
@@ -40,3 +42,26 @@ 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 an authentic 15-bit LFSR (Linear Feedback Shift Register) pseudo-random noise buffer.
+ * Uses characteristic polynomial x^15 + x^14 + 1 to emulate vintage digital textures (e.g. TR-909 Snappy).
+ * @param context - Web Audio Context (any used to bypass Tone.js type mismatch)
+ * @param duration - Duration in seconds
+ */
+export function generateLFSRNoise(context: any, duration: number): AudioBuffer {
+    const sampleRate = context.sampleRate;
+    const bufferSize = Math.floor(sampleRate * duration);
+    const buffer = context.createBuffer(1, bufferSize, sampleRate);
+    const data = buffer.getChannelData(0);
+
+    let state = 0x7FFF; // Initial 15-bit state (cannot be 0)
+    for (let i = 0; i < bufferSize; i++) {
+        // LFSR with taps at 15 and 14 (0-indexed: 14 and 13)
+        // bit = bit15 XOR bit14
+        const bit = ((state >> 14) ^ (state >> 13)) & 1;
+        state = ((state << 1) | bit) & 0x7FFF;
+        data[i] = (state & 1) ? 1 : -1;
+    }
+    return buffer;
+}
diff --git a/src/logic/drums/TR808Clap.ts b/src/logic/drums/TR808Clap.ts
@@ -12,6 +12,8 @@ export class TR808Clap {
     }
 
     trigger(time: number, pitch: number, decay: number, velocity: number = 0.8) {
+        if (velocity <= 0) return;
+
         const noiseSrc = new Tone.BufferSource(this.noiseBuffer);
         const bpfFreq = (1000 + pitch * 1000);
         const bpf = new Tone.Filter(applyVariance(bpfFreq, 0.02), "bandpass");
@@ -27,16 +29,16 @@ 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
         const finalDecayStart = time + snapCount * snapInterval;
         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);

diff --git 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<Tone.Gain> = 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
@@ -15,6 +17,8 @@ export class TR808Cowbell {
 
         const osc1 = new Tone.Oscillator(freq1, "square");
         const osc2 = new Tone.Oscillator(freq2, "square");
+        osc1.phase = Math.random() * 360;
+        osc2.phase = Math.random() * 360;
 
         const mixGain = new Tone.Gain(0.5);
         const bpf = new Tone.Filter(applyVariance(800, 0.02), "bandpass");
@@ -30,10 +34,11 @@ 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 +50,16 @@ 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
@@ -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<Tone.Gain> = 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");
@@ -20,15 +22,14 @@ export class TR808HiHat {
 
         // Create 6 Square Wave Oscillators (Schmitt Trigger Matrix)
         const oscillators = this.frequencies.map(freq => {
-            const driftedFreq = applyPitchDrift(freq * pitchMultiplier, 2.0); // +/- 2Hz drift for hats
+            const driftedFreq = applyPitchDrift(freq * pitchMultiplier, 2.0); // +/- 2 cents
             const osc = new Tone.Oscillator(driftedFreq, "square");
             osc.phase = Math.random() * 360;
             osc.connect(mixGain);
             return osc;
         });
 
         // Routing Graph
-        // Oscillators -> MixGain -> [BPF1, BPF2] (Parallel) -> EnvGain -> HPF -> Destination
         mixGain.connect(bpf1);
         mixGain.connect(bpf2);
         bpf1.connect(envGain);
@@ -48,34 +49,35 @@ 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 => {
             osc.start(time).stop(time + decayTime);
         });
 
-        // Disposal - Explicitly clean up all 11-12 nodes to prevent memory leaks
-        // We use the first oscillator's onstop event to trigger the cleanup
+        // Disposal
         oscillators[0].onstop = () => {
             oscillators.forEach(o => o.dispose());
             mixGain.dispose();
             bpf1.dispose();
             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);
+            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
@@ -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
@@ -19,22 +21,31 @@ export class TR808Kick {
         masterGain.connect(this.destination);
 
         // Micro-randomization using shared utilities
-        const tuneDrift = applyPitchDrift(tune, 1.0);
+        const tuneDrift = applyPitchDrift(tune, 1.0); // +/- 1 cent
         const finalDecay = applyVariance(decayTime, 0.02);
 
-        // Pitch Envelope: Start high (Tune * 2.5) and drop quickly (50ms) to simulate the membrane hit ('tonk')
-        // This rapid sweep generates the punch without needing a separate click oscillator
+        // Two-stage Pitch Envelope:
+        // 1. Rapid drop (membrane hit 'tonk') from startFreq to midFreq in 20ms
+        // 2. Slower drop to final tune in another 30ms (total 50ms sweep)
         const startFreq = tuneDrift * 2.5;
+        const midFreq = tuneDrift * 1.2;
         const endFreq = tuneDrift;
 
         osc.frequency.setValueAtTime(startFreq, time);
+        osc.frequency.exponentialRampToValueAtTime(midFreq, time + 0.02);
         osc.frequency.exponentialRampToValueAtTime(endFreq, time + 0.05);
 
-        // VCA Amp Envelope: Instant attack, adjustable exponential decay
+        // Two-stage VCA Amp Envelope:
+        // 1. Fast damping (20ms) to 50% volume (emulating diode damping)
+        // 2. Long exponential decay to zero
+        const dampingTime = 0.02;
+        const safeFinalDecay = Math.max(dampingTime + 0.01, finalDecay);
+
         masterGain.gain.setValueAtTime(velocity, time);
-        masterGain.gain.exponentialRampToValueAtTime(0.001, time + finalDecay);
+        masterGain.gain.exponentialRampToValueAtTime(velocity * 0.5, time + dampingTime);
+        masterGain.gain.exponentialRampToValueAtTime(0.001, time + safeFinalDecay);
 
-        osc.start(time).stop(time + finalDecay);
+        osc.start(time).stop(time + safeFinalDecay);
 
         osc.onstop = () => {
             osc.dispose();

diff --git a/src/logic/drums/TR808Snare.ts b/src/logic/drums/TR808Snare.ts
@@ -15,6 +15,8 @@ export class TR808Snare {
     }
 
     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;
 
@@ -40,10 +42,10 @@ 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
@@ -61,11 +63,13 @@ 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);
+
+        // disposal is anchored to the noise source
         noiseSrc.start(time).stop(time + snappyDecay + 0.1);
 
         // Cleanup