Phase 22-23: Complete Synthesis Engine + Percussion Expansion

app/scripts/session-api.ts

@@ -57,10 +57,12 @@ interface ValidationError {
 }
 
 const VALID_SAMPLE_IDS = [
-  // Drums
+  // Core kit
   'kick', 'snare', 'hihat', 'clap', 'tom', 'rim', 'cowbell', 'openhat',
+  // World/Latin percussion (Phase 23)
+  'shaker', 'conga', 'tambourine', 'clave', 'cabasa', 'woodblock',
   // Bass/Synth samples
-  'bass', 'sub',
+  'bass', 'subbass',
   // Melodic samples
   'lead', 'pluck', 'chord', 'pad',
   // FX

app/scripts/sessions/extended-afrobeat.json

@@ -131,7 +131,7 @@
     {
       "id": "keys-afro",
       "name": "Keys",
-      "sampleId": "synth:piano",
+      "sampleId": "sampled:piano",
       "steps": [
         false, false, false, true, false, false, false, false, false, true, false, false,
         false, false, false, true, false, false, false, false, false, true, false, true,

app/scripts/sessions/latin-percussion-showcase.json

@@ -0,0 +1,116 @@
+{
+  "name": "Latin Percussion Showcase",
+  "description": "Demonstrates all 6 new Phase 23 percussion instruments: shaker, conga, tambourine, clave, cabasa, and woodblock. Features authentic Latin rhythms with polyrhythmic interplay.",
+  "tracks": [
+    {
+      "id": "kick-foundation",
+      "name": "Kick",
+      "sampleId": "kick",
+      "steps": [true, false, false, false, false, false, true, false, false, false, false, false, true, false, false, false],
+      "parameterLocks": [{"volume": 1.0}, null, null, null, null, null, {"volume": 0.8}, null, null, null, null, null, {"volume": 0.9}, null, null, null],
+      "volume": 0.85,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "clave-pattern",
+      "name": "Clave",
+      "sampleId": "clave",
+      "steps": [true, false, false, true, false, false, true, false, false, false, true, false, true, false, false, false],
+      "parameterLocks": [{"volume": 0.9}, null, null, {"volume": 0.7}, null, null, {"volume": 0.8}, null, null, null, {"volume": 0.7}, null, {"volume": 0.9}, null, null, null],
+      "volume": 0.6,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "conga-high",
+      "name": "Conga Hi",
+      "sampleId": "conga",
+      "steps": [false, false, true, false, true, false, false, true, false, false, true, false, true, false, false, true],
+      "parameterLocks": [null, null, {"pitch": 7, "volume": 0.8}, null, {"pitch": 5, "volume": 0.7}, null, null, {"pitch": 7, "volume": 0.6}, null, null, {"pitch": 5, "volume": 0.8}, null, {"pitch": 7, "volume": 0.7}, null, null, {"pitch": 5, "volume": 0.6}],
+      "volume": 0.65,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "conga-low",
+      "name": "Conga Lo",
+      "sampleId": "conga",
+      "steps": [true, false, false, false, false, true, false, false, true, false, false, false, false, true, false, false],
+      "parameterLocks": [{"pitch": -5, "volume": 0.9}, null, null, null, null, {"pitch": -7, "volume": 0.7}, null, null, {"pitch": -5, "volume": 0.8}, null, null, null, null, {"pitch": -7, "volume": 0.7}, null, null],
+      "volume": 0.7,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "shaker-groove",
+      "name": "Shaker",
+      "sampleId": "shaker",
+      "steps": [true, false, true, true, false, true, true, false, true, true, false, true, true, false, true, true],
+      "parameterLocks": [{"volume": 0.9}, null, {"volume": 0.5}, {"volume": 0.7}, null, {"volume": 0.5}, {"volume": 0.8}, null, {"volume": 0.5}, {"volume": 0.7}, null, {"volume": 0.5}, {"volume": 0.9}, null, {"volume": 0.5}, {"volume": 0.7}],
+      "volume": 0.45,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "tambourine-accent",
+      "name": "Tamb",
+      "sampleId": "tambourine",
+      "steps": [false, false, false, false, true, false, false, false, false, false, false, false, true, false, false, false],
+      "parameterLocks": [null, null, null, null, {"volume": 1.0}, null, null, null, null, null, null, null, {"volume": 0.9}, null, null, null],
+      "volume": 0.55,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "cabasa-texture",
+      "name": "Cabasa",
+      "sampleId": "cabasa",
+      "steps": [false, true, false, true, false, true, false, true, false, true, false, true, false, true, false, true],
+      "parameterLocks": [null, {"volume": 0.6}, null, {"volume": 0.4}, null, {"volume": 0.5}, null, {"volume": 0.4}, null, {"volume": 0.6}, null, {"volume": 0.4}, null, {"volume": 0.5}, null, {"volume": 0.4}],
+      "volume": 0.4,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "woodblock-accent",
+      "name": "Wood",
+      "sampleId": "woodblock",
+      "steps": [false, false, false, false, false, false, false, false, true, false, false, false, false, false, true, false],
+      "parameterLocks": [null, null, null, null, null, null, null, null, {"volume": 0.8, "pitch": 3}, null, null, null, null, null, {"volume": 0.7, "pitch": 0}, null],
+      "volume": 0.5,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": 0,
+      "stepCount": 16
+    },
+    {
+      "id": "bass-montuno",
+      "name": "Bass",
+      "sampleId": "synth:bass",
+      "steps": [true, false, false, true, false, false, true, false, false, true, false, false, true, false, true, false],
+      "parameterLocks": [{"pitch": 0}, null, null, {"pitch": 0}, null, null, {"pitch": 3}, null, null, {"pitch": 5}, null, null, {"pitch": 3}, null, {"pitch": 0}, null],
+      "volume": 0.7,
+      "muted": false,
+      "playbackMode": "oneshot",
+      "transpose": -12,
+      "stepCount": 16
+    }
+  ],
+  "tempo": 105,
+  "swing": 12
+}

app/scripts/sessions/progressive-house-build.json

@@ -125,7 +125,7 @@
     {
       "id": "piano-chords",
       "name": "Piano Chords",
-      "sampleId": "synth:piano",
+      "sampleId": "sampled:piano",
       "steps": [
         false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false,
         false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false,

app/src/audio/instrument-routing.test.ts

@@ -55,9 +55,9 @@ const ALL_TONE_SYNTHS = Object.values(TONE_SYNTH_CATEGORIES).flat();
 const ALL_ADVANCED_SYNTHS = Object.values(ADVANCED_SYNTH_CATEGORIES).flat();
 
 describe('Comprehensive Instrument Routing', () => {
-  describe('Procedural Samples (16 samples)', () => {
-    it('should have 16 procedural samples', () => {
-      expect(ALL_PROCEDURAL_SAMPLES.length).toBe(16);
+  describe('Procedural Samples (22 samples)', () => {
+    it('should have 22 procedural samples', () => {
+      expect(ALL_PROCEDURAL_SAMPLES.length).toBe(22);
     });
 
     it('all procedural samples should route to sample engine', () => {
@@ -82,7 +82,7 @@ describe('Comprehensive Instrument Routing', () => {
         engine: getInstrumentEngine(id),
       }));
       // This logs for manual verification and serves as documentation
-      expect(samples.length).toBe(16);
+      expect(samples.length).toBe(22);
     });
   });
 
@@ -250,15 +250,15 @@ describe('Comprehensive Instrument Routing', () => {
   });
 
   describe('Total Instrument Count', () => {
-    it('should have 68 total instruments (16 + 32 + 11 + 8 + 1)', () => {
+    it('should have 74 total instruments (22 + 32 + 11 + 8 + 1)', () => {
       const total =
         ALL_PROCEDURAL_SAMPLES.length +
         ALL_SYNTH_PRESETS.length +
         ALL_TONE_SYNTHS.length +
         ALL_ADVANCED_SYNTHS.length +
         SAMPLED_INSTRUMENTS.length;
 
-      expect(total).toBe(68);
+      expect(total).toBe(74);
     });
   });
 

app/src/audio/samples.test.ts

@@ -57,9 +57,9 @@ describe('Sample ID parity', () => {
   });
 
   it('should have expected sample count', () => {
-    // 8 drums + 2 bass + 4 synth + 2 fx = 16 samples
-    expect(allSampleIds.length).toBe(16);
-    expect(SAMPLE_CATEGORIES.drums.length).toBe(8);
+    // 14 drums + 2 bass + 4 synth + 2 fx = 22 samples
+    expect(allSampleIds.length).toBe(22);
+    expect(SAMPLE_CATEGORIES.drums.length).toBe(14);
     expect(SAMPLE_CATEGORIES.bass.length).toBe(2);
     expect(SAMPLE_CATEGORIES.synth.length).toBe(4);
     expect(SAMPLE_CATEGORIES.fx.length).toBe(2);

app/src/audio/samples.ts

@@ -65,6 +65,49 @@ export async function createSynthesizedSamples(
     url: '',
   });
 
+  // === WORLD/LATIN PERCUSSION ===
+  samples.set('shaker', {
+    id: 'shaker',
+    name: 'Shaker',
+    buffer: await createShaker(audioContext),
+    url: '',
+  });
+
+  samples.set('conga', {
+    id: 'conga',
+    name: 'Conga',
+    buffer: await createConga(audioContext),
+    url: '',
+  });
+
+  samples.set('tambourine', {
+    id: 'tambourine',
+    name: 'Tambourine',
+    buffer: await createTambourine(audioContext),
+    url: '',
+  });
+
+  samples.set('clave', {
+    id: 'clave',
+    name: 'Clave',
+    buffer: await createClave(audioContext),
+    url: '',
+  });
+
+  samples.set('cabasa', {
+    id: 'cabasa',
+    name: 'Cabasa',
+    buffer: await createCabasa(audioContext),
+    url: '',
+  });
+
+  samples.set('woodblock', {
+    id: 'woodblock',
+    name: 'Woodblock',
+    buffer: await createWoodblock(audioContext),
+    url: '',
+  });
+
   // === BASS ===
   samples.set('bass', {
     id: 'bass',
@@ -284,6 +327,141 @@ async function createOpenHat(ctx: AudioContext): Promise<AudioBuffer> {
   return buffer;
 }
 
+// === World/Latin Percussion ===
+
+async function createShaker(ctx: AudioContext): Promise<AudioBuffer> {
+  const duration = 0.15;
+  const sampleRate = ctx.sampleRate;
+  const length = Math.floor(duration * sampleRate);
+  const buffer = ctx.createBuffer(1, length, sampleRate);
+  const data = buffer.getChannelData(0);
+
+  for (let i = 0; i < length; i++) {
+    const t = i / sampleRate;
+    // High-frequency noise with fast attack/decay
+    const noise = Math.random() * 2 - 1;
+    const envelope = Math.exp(-t * 25) * (1 - Math.exp(-t * 500));
+    // Simple highpass approximation
+    const filtered = noise * 0.7 + (Math.random() * 0.6 - 0.3);
+    data[i] = filtered * envelope * 0.6;
+  }
+
+  return buffer;
+}
+
+async function createConga(ctx: AudioContext): Promise<AudioBuffer> {
+  const duration = 0.4;
+  const sampleRate = ctx.sampleRate;
+  const length = Math.floor(duration * sampleRate);
+  const buffer = ctx.createBuffer(1, length, sampleRate);
+  const data = buffer.getChannelData(0);
+
+  for (let i = 0; i < length; i++) {
+    const t = i / sampleRate;
+    // Pitched membrane sound with slight pitch drop
+    const freq = 200 * Math.exp(-t * 3);
+    const fundamental = Math.sin(2 * Math.PI * freq * t);
+    // Add harmonics for wood/skin character
+    const harmonic2 = Math.sin(2 * Math.PI * freq * 2.3 * t) * 0.3;
+    const harmonic3 = Math.sin(2 * Math.PI * freq * 3.1 * t) * 0.15;
+    // Attack transient (slap)
+    const slap = (Math.random() * 2 - 1) * Math.exp(-t * 100) * 0.4;
+    // Envelope
+    const envelope = Math.exp(-t * 6);
+    data[i] = (fundamental + harmonic2 + harmonic3 + slap) * envelope * 0.7;
+  }
+
+  return buffer;
+}
+
+async function createTambourine(ctx: AudioContext): Promise<AudioBuffer> {
+  const duration = 0.25;
+  const sampleRate = ctx.sampleRate;
+  const length = Math.floor(duration * sampleRate);
+  const buffer = ctx.createBuffer(1, length, sampleRate);
+  const data = buffer.getChannelData(0);
+
+  for (let i = 0; i < length; i++) {
+    const t = i / sampleRate;
+    // Metallic jingles (multiple inharmonic frequencies)
+    const jingle1 = Math.sin(2 * Math.PI * 2100 * t);
+    const jingle2 = Math.sin(2 * Math.PI * 3400 * t);
+    const jingle3 = Math.sin(2 * Math.PI * 4800 * t);
+    const jingle4 = Math.sin(2 * Math.PI * 6200 * t);
+    // Noise component for stick hit
+    const noise = (Math.random() * 2 - 1) * Math.exp(-t * 50);
+    // Envelope with sustain for jingles
+    const envelope = Math.exp(-t * 8);
+    const jingles = (jingle1 + jingle2 * 0.7 + jingle3 * 0.5 + jingle4 * 0.3) * 0.15;
+    data[i] = (jingles + noise * 0.3) * envelope;
+  }
+
+  return buffer;
+}
+
+async function createClave(ctx: AudioContext): Promise<AudioBuffer> {
+  const duration = 0.12;
+  const sampleRate = ctx.sampleRate;
+  const length = Math.floor(duration * sampleRate);
+  const buffer = ctx.createBuffer(1, length, sampleRate);
+  const data = buffer.getChannelData(0);
+
+  for (let i = 0; i < length; i++) {
+    const t = i / sampleRate;
+    // Two-tone wooden click (like two sticks hitting)
+    const freq1 = 2500;
+    const freq2 = 3200;
+    const tone1 = Math.sin(2 * Math.PI * freq1 * t);
+    const tone2 = Math.sin(2 * Math.PI * freq2 * t) * 0.6;
+    // Very fast decay
+    const envelope = Math.exp(-t * 40);
+    data[i] = (tone1 + tone2) * envelope * 0.6;
+  }
+
+  return buffer;
+}
+
+async function createCabasa(ctx: AudioContext): Promise<AudioBuffer> {
+  const duration = 0.08;
+  const sampleRate = ctx.sampleRate;
+  const length = Math.floor(duration * sampleRate);
+  const buffer = ctx.createBuffer(1, length, sampleRate);
+  const data = buffer.getChannelData(0);
+
+  for (let i = 0; i < length; i++) {
+    const t = i / sampleRate;
+    // Very high frequency noise burst
+    const noise = Math.random() * 2 - 1;
+    // Very fast attack and decay
+    const envelope = Math.exp(-t * 60) * (1 - Math.exp(-t * 2000));
+    data[i] = noise * envelope * 0.5;
+  }
+
+  return buffer;
+}
+
+async function createWoodblock(ctx: AudioContext): Promise<AudioBuffer> {
+  const duration = 0.15;
+  const sampleRate = ctx.sampleRate;
+  const length = Math.floor(duration * sampleRate);
+  const buffer = ctx.createBuffer(1, length, sampleRate);
+  const data = buffer.getChannelData(0);
+
+  for (let i = 0; i < length; i++) {
+    const t = i / sampleRate;
+    // Resonant filtered click
+    const freq = 800;
+    const fundamental = Math.sin(2 * Math.PI * freq * t);
+    const harmonic = Math.sin(2 * Math.PI * freq * 2.7 * t) * 0.4;
+    // Sharp attack, medium decay with resonance
+    const envelope = Math.exp(-t * 20);
+    const attack = Math.exp(-t * 200);
+    data[i] = (fundamental + harmonic) * envelope * (0.7 + attack * 0.3);
+  }
+
+  return buffer;
+}
+
 // === Bass ===
 
 async function createBass(ctx: AudioContext): Promise<AudioBuffer> {