kai9987kai.github.io/Audiolab.html at master · kai9987kai/kai9987kai.github.io · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>Brain-Stim Audio Lab — Web Audio API</title>
<style>
  :root{
    --bg:#0b0e14; --panel:#111623; --ink:#e6edf3; --muted:#9fb0c2; --acc:#6ea8fe; --ok:#47d16a; --warn:#ffcc66; --bad:#ff6b6b;
    --card:#0f1320; --br:16px;
  }
  *{box-sizing:border-box}
  body{margin:0;background:linear-gradient(180deg,#0b0e14 0%,#0a0f1c 100%);color:var(--ink);font:500 15px/1.45 system-ui,Segoe UI,Roboto,Inter,sans-serif}
  header{padding:28px 20px 8px; text-align:center}
  header h1{margin:0 0 6px;font:700 28px/1.1 ui-sans-serif;letter-spacing:.2px}
  header p{margin:0;color:var(--muted)}
  .wrap{max-width:1100px;margin:20px auto 60px;padding:0 16px}
  .grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}
  .card{grid-column:span 12;background:var(--card);border:1px solid #1d2640;border-radius:var(--br);padding:16px;box-shadow:0 10px 30px rgba(0,0,0,.25)}
  @media(min-width:900px){ .card.sm{grid-column:span 6} .card.xs{grid-column:span 4} }
  h2{margin:0 0 10px;font:700 18px/1.2 ui-sans-serif}
  .row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:8px 0}
  .row label{font-size:13px;color:var(--muted)}
  .row input[type=range]{width:180px}
  .kpi{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
  .pill{padding:6px 10px;border-radius:999px;background:#0b1222;border:1px solid #223057;color:var(--muted);font-size:12px}
  .btn{appearance:none;border:1px solid #2b3d6e;background:#13203b;color:#dce7ff;border-radius:12px;padding:8px 12px;font-weight:600;cursor:pointer;transition:.2s}
  .btn:hover{filter:brightness(1.1)}
  .btn.prim{background:linear-gradient(180deg,#224c96 0%,#1a3d79 100%);border-color:#315aa3}
  .btn.good{background:linear-gradient(180deg,#1f8f41,#187735);border-color:#2fb45a}
  .btn.attn{background:linear-gradient(180deg,#c26212,#9b4e0d);border-color:#d9842c}
  .btn.stop{background:linear-gradient(180deg,#9c1e1e,#7d1515);border-color:#c33d3d}
  .tiny{font-size:12px;color:var(--muted)}
  .warn{color:var(--warn)}
  .bad{color:var(--bad)}
  .switch{display:inline-flex;align-items:center;gap:8px}
  .switch input{accent-color:var(--acc)}
  .hr{height:1px;background:#1f2945;margin:10px 0 12px}
  .foot{opacity:.85;margin-top:6px;font-size:12px}
  code{background:#0c1222;border:1px solid #1e2b51;border-radius:8px;padding:2px 6px;font-size:12px}
</style>
</head>
<body>
<header>
  <h1>Brain-Stim Audio Lab</h1>
  <p>40 Hz ASSR • 30–150 Hz “roughness” • Groove syncopation • Oddball (MMN) • Binaural beats • Soft taps<br><span class="tiny">Local Web Audio — no external files</span></p>
</header>

<div class="wrap">
  <div class="grid">

    <div class="card">
      <h2>Master</h2>
      <div class="kpi">
        <button id="startCtx" class="btn prim">▶ Start Audio</button>
        <button id="stopAll" class="btn stop">⏹ Stop All</button>
        <span class="pill">Global Volume <input id="vol" type="range" min="0" max="0.25" step="0.001" value="0.06"> <span id="volVal">0.06</span></span>
        <span class="pill">Soft Limiter: <span id="limLight">armed</span></span>
        <span class="pill">Sample Rate: <span id="sr">—</span></span>
      </div>
      <div class="row tiny">
        <span class="warn">Safety:</span> Start low, increase slowly. If you need to raise your voice to talk to someone an arm’s length away, it’s too loud.
        (NIOSH 85 dBA/8 h, 3 dB exchange; WHO leisure ≈ 80 dB for ≤ 40 h/week).
      </div>
      <div class="row">
        <button class="btn good" id="presetFocus">Preset: Groove Focus</button>
        <button class="btn attn" id="presetArousal">Preset: Max Arousal (short)</button>
        <button class="btn" id="presetRelax">Preset: Relax (low level)</button>
      </div>
    </div>

    <div class="card sm">
      <h2>40 Hz ASSR</h2>
      <div class="row">
        <label class="switch"><input type="checkbox" id="assrOn"> Enable</label>
        <label>Rate <input id="assrRate" type="range" min="30" max="50" step="0.1" value="40"> <span id="assrRateVal">40.0</span> Hz</label>
        <label>Pulse width <input id="assrPW" type="range" min="0.5" max="8" step="0.1" value="3"> <span id="assrPWVal">3.0</span> ms</label>
      </div>
      <div class="foot tiny">Strongest steady-state responses often near ~40 Hz. Use brief sessions at modest level.</div>
    </div>

    <div class="card sm">
      <h2>“Roughness” AM Noise (Scream-like)</h2>
      <div class="row">
        <label class="switch"><input type="checkbox" id="roughOn"> Enable</label>
        <label>AM rate <input id="roughRate" type="range" min="30" max="150" step="1" value="90"> <span id="roughRateVal">90</span> Hz</label>
        <label>Burst ms <input id="roughBurst" type="range" min="50" max="800" step="10" value="250"> <span id="roughBurstVal">250</span> ms</label>
        <button class="btn attn" id="roughPing">⚡ Single Burst</button>
      </div>
      <div class="foot tiny">High salience; can be unpleasant. Keep brief and quiet.</div>
    </div>

    <div class="card sm">
      <h2>Groove Drum Machine (Syncopation)</h2>
      <div class="row">
        <label class="switch"><input type="checkbox" id="grooveOn"> Run</label>
        <label>BPM <input id="grooveBPM" type="range" min="70" max="140" step="1" value="108"> <span id="grooveBPMVal">108</span></label>
        <label>Syncopation <input id="grooveSync" type="range" min="0" max="1" step="0.01" value="0.5"> <span id="grooveSyncVal">0.50</span></label>
      </div>
      <div class="foot tiny">Medium syncopation → strongest “urge to move” for most listeners.</div>
    </div>

    <div class="card sm">
      <h2>Oddball (MMN) Beeps</h2>
      <div class="row">
        <label class="switch"><input type="checkbox" id="mmnOn"> Run</label>
        <label>Std f <input id="mmnStd" type="range" min="300" max="1200" step="1" value="600"> <span id="mmnStdVal">600</span> Hz</label>
        <label>Δf dev (%) <input id="mmnDelta" type="range" min="2" max="20" step="1" value="8"> <span id="mmnDeltaVal">8</span>%</label>
        <label>Deviant prob <input id="mmnProb" type="range" min="0.05" max="0.2" step="0.01" value="0.1"> <span id="mmnProbVal">0.10</span></label>
        <label>ISI ms <input id="mmnISI" type="range" min="200" max="1200" step="10" value="500"> <span id="mmnISIVal">500</span></label>
      </div>
      <div class="foot tiny">Infrequent deviants among standards → preattentive deviance detection.</div>
    </div>

    <div class="card sm">
      <h2>Binaural Beats (Headphones)</h2>
      <div class="row">
        <label class="switch"><input type="checkbox" id="bbOn"> Enable</label>
        <label>Carrier f <input id="bbCar" type="range" min="150" max="600" step="1" value="300"> <span id="bbCarVal">300</span> Hz</label>
        <label>Beat f <input id="bbBeat" type="range" min="1" max="40" step="0.1" value="6"> <span id="bbBeatVal">6.0</span> Hz</label>
      </div>
      <div class="foot tiny">Evidence mixed; use gently, headphones only. Don’t expect magic.</div>
    </div>

    <div class="card sm">
      <h2>Soft Taps / “ASMR-ish”</h2>
      <div class="row">
        <label class="switch"><input type="checkbox" id="asmrOn"> Run</label>
        <label>Avg rate <input id="asmrRate" type="range" min="0.2" max="4" step="0.1" value="1.2"> <span id="asmrRateVal">1.2</span> /s</label>
        <label>Randomness <input id="asmrRand" type="range" min="0" max="1" step="0.01" value="0.6"> <span id="asmrRandVal">0.60</span></label>
      </div>
      <div class="foot tiny">Low-level, close-mic tapping-like transients; some listeners relax, others don’t.</div>
    </div>

  </div>
</div>

<script>
(() => {
  let ctx=null, master=null, limiter=null, limiterGain=null;
  const $ = sel => document.querySelector(sel);
  const v = id => +$(id).value;

  function initCtx(){
    if(ctx) return;
    ctx = new (window.AudioContext||window.webkitAudioContext)({latencyHint:"interactive"});
    master = ctx.createGain(); master.gain.value = v('#vol');
    // soft limiter: waveshaper + makeup control
    const preGain = ctx.createGain(); preGain.gain.value = 1.0;
    const ws = ctx.createWaveShaper(); ws.curve = makeLimiterCurve(0.6, 10); // knee, drive
    limiterGain = ctx.createGain(); limiterGain.gain.value = 0.9;
    master.connect(preGain).connect(ws).connect(limiterGain).connect(ctx.destination);
    $('#sr').textContent = ctx.sampleRate+" Hz";
  }
  function makeLimiterCurve(knee, drive){
    const n=2048, curve=new Float32Array(n);
    for(let i=0;i<n;i++){
      const x = (i/(n-1))*2-1;
      const ax = Math.abs(x), s = Math.sign(x);
      const t = ax<knee ? x : s*(knee + (1 - Math.exp(-(ax-knee)*drive))/drive);
      curve[i] = t;
    }
    return curve;
  }

  // ==== 40 Hz ASSR (click train by gated noise) ====
  let assr = {on:false, shaper:null, gate:null, noise:null, rate:40, pw:0.003, tRef:0};
  function assrStart(){
    if(assr.on) return;
    assr.on = true;
    assr.noise = noiseNode('white', 0.35);
    assr.gate = ctx.createGain(); assr.gate.gain.value = 0.0;
    assr.noise.connect(assr.gate).connect(master);
    assr.tRef = ctx.currentTime;
    assrScheduler();
  }
  function assrStop(){
    if(!assr.on) return;
    assr.on=false;
    if(assr.noise){assr.noise.stop(); assr.noise.disconnect();}
    if(assr.gate){assr.gate.disconnect();}
  }
  function assrScheduler(){
    if(!assr.on) return;
    const look = 0.2, now = ctx.currentTime;
    const T = 1/assr.rate, pw = Math.min(assr.pw, T*0.9);
    while(assr.tRef < now+look){
      const a = assr.gate.gain;
      a.cancelScheduledValues(assr.tRef);
      a.setValueAtTime(0.0, assr.tRef);
      a.linearRampToValueAtTime(1.0, assr.tRef + 0.001);
      a.setValueAtTime(1.0, assr.tRef + pw);
      a.linearRampToValueAtTime(0.0, assr.tRef + pw + 0.001);
      assr.tRef += T;
    }
    setTimeout(assrScheduler, 50);
  }

  // ==== Roughness AM noise (30–150 Hz) ====
  let rough = {on:false, noise:null, vca:null, lfo:null};
  function roughStart(){
    if(rough.on) return;
    rough.on = true;
    rough.noise = noiseNode('white', 0.4);
    rough.vca = ctx.createGain(); rough.vca.gain.value = 0.0;
    rough.lfo = ctx.createOscillator(); rough.lfo.frequency.value = v('#roughRate');
    const lfoGain = ctx.createGain(); lfoGain.gain.value = 0.5; // 50% depth (0..1)
    rough.lfo.connect(lfoGain).connect(rough.vca.gain);
    rough.noise.connect(rough.vca).connect(master);
    rough.lfo.start();
    // bring up base gain slowly
    rough.vca.gain.setTargetAtTime(0.25, ctx.currentTime, 0.25);
  }
  function roughStop(){
    if(!rough.on) return;
    rough.on=false;
    if(rough.lfo){rough.lfo.stop(); rough.lfo.disconnect();}
    if(rough.noise){rough.noise.stop(); rough.noise.disconnect();}
    if(rough.vca){rough.vca.disconnect();}
  }
  function roughBurst(ms){
    if(!ctx) return;
    const n = noiseNode('white', 0.5);
    const vca = ctx.createGain(); vca.gain.value = 0;
    const lfo = ctx.createOscillator(); lfo.frequency.value = v('#roughRate');
    const lfoGain = ctx.createGain(); lfoGain.gain.value = 0.5;
    lfo.connect(lfoGain).connect(vca.gain);
    n.connect(vca).connect(master);
    lfo.start();
    const t = ctx.currentTime;
    vca.gain.cancelScheduledValues(t);
    vca.gain.setValueAtTime(0, t);
    vca.gain.linearRampToValueAtTime(0.3, t+0.01);
    vca.gain.setValueAtTime(0.3, t+ms/1000);
    vca.gain.linearRampToValueAtTime(0, t+ms/1000+0.02);
    setTimeout(()=>{lfo.stop(); n.stop(); vca.disconnect();}, ms+80);
  }

  // ==== Groove Drum (kick/snare/hat) with syncopation ====
  let groove = {on:false, timer:null, next:0, bpm:108, sync:0.5, step:0};
  function grooveStart(){ if(groove.on) return; groove.on=true; groove.next=ctx.currentTime; groove.step=0; grooveTick(); }
  function grooveStop(){ groove.on=false; if(groove.timer){clearTimeout(groove.timer); groove.timer=null;} }
  function grooveTick(){
    if(!groove.on) return;
    const spb = 60/groove.bpm, now = ctx.currentTime;
    while(groove.next < now+0.2){
      const s = groove.step % 16;
      // base pattern
      if(s===0||s===8) kick(groove.next, 0.85);
      if(s===4||s===12) snare(groove.next, 0.5);
      // hats: on-beats + syncopated off-beats probability
      hat(groove.next, 0.18);
      const syncProb = groove.sync; // add off-beat hat or ghost snare
      if(Math.random() < syncProb*0.5) hat(groove.next+spb*0.5, 0.12);
      if(Math.random() < syncProb*0.25 && (s%4===2)) snare(groove.next, 0.2, true); // ghost
      groove.next += spb/4; groove.step++;
    }
    groove.timer = setTimeout(grooveTick, 25);
  }
  function kick(t, amp=0.8){
    const o = ctx.createOscillator(); o.type='sine'; o.frequency.setValueAtTime(90, t);
    const g = ctx.createGain(); g.gain.setValueAtTime(0.0001, t);
    g.gain.exponentialRampToValueAtTime(amp*0.8, t+0.002);
    g.gain.exponentialRampToValueAtTime(0.0001, t+0.18);
    o.frequency.exponentialRampToValueAtTime(40, t+0.12);
    o.connect(g).connect(master); o.start(t); o.stop(t+0.22);
  }
  function snare(t, amp=0.5, ghost=false){
    const n = noiseNode('white', 0.7);
    const bp = ctx.createBiquadFilter(); bp.type='bandpass'; bp.frequency.value=1800; bp.Q.value=0.6;
    const g = ctx.createGain(); g.gain.setValueAtTime(0.0001,t);
    const a = amp*(ghost?0.18:1);
    g.gain.exponentialRampToValueAtTime(a, t+0.002);
    g.gain.exponentialRampToValueAtTime(0.0001, t+0.2);
    n.connect(bp).connect(g).connect(master);
    setTimeout(()=>{n.stop(); bp.disconnect(); g.disconnect();}, 220);
  }
  function hat(t, amp=0.15){
    const n = noiseNode('white', 0.5);
    const hp = ctx.createBiquadFilter(); hp.type='highpass'; hp.frequency.value=6000; hp.Q.value=0.7;
    const g = ctx.createGain(); g.gain.setValueAtTime(0.0001,t);
    g.gain.exponentialRampToValueAtTime(amp, t+0.002);
    g.gain.exponentialRampToValueAtTime(0.0001, t+0.06);
    n.connect(hp).connect(g).connect(master);
    setTimeout(()=>{n.stop(); hp.disconnect(); g.disconnect();}, 80);
  }

  // ==== Oddball beeps (MMN-style) ====
  let mmn={on:false, timer:null};
  function mmnStart(){ if(mmn.on) return; mmn.on=true; mmnTick(); }
  function mmnStop(){ mmn.on=false; if(mmn.timer) clearTimeout(mmn.timer); }
  function mmnTick(){
    if(!mmn.on) return;
    const std = v('#mmnStd'), delta = v('#mmnDelta')/100, p = v('#mmnProb'), isi = v('#mmnISI')/1000;
    const isDev = Math.random() < p;
    const f = isDev ? std*(1+delta) : std;
    beep(f, 0.07);
    mmn.timer = setTimeout(mmnTick, isi*1000);
  }
  function beep(freq, dur=0.07){
    const o = ctx.createOscillator(); o.type='sine'; o.frequency.value = freq;
    const g = ctx.createGain(); g.gain.value=0.0001;
    const t = ctx.currentTime;
    g.gain.exponentialRampToValueAtTime(0.15, t+0.005);
    g.gain.exponentialRampToValueAtTime(0.0001, t+dur);
    o.connect(g).connect(master); o.start(t); o.stop(t+dur+0.01);
  }

  // ==== Binaural beats ====
  let bb={on:false, l:null, r:null, gl:null, gr:null};
  function bbStart(){
    if(bb.on) return; bb.on=true;
    const car = v('#bbCar'), beat = v('#bbBeat');
    bb.l = ctx.createOscillator(); bb.r = ctx.createOscillator(); bb.l.type='sine'; bb.r.type='sine';
    bb.l.frequency.value = car - beat/2; bb.r.frequency.value = car + beat/2;
    bb.gl=ctx.createGain(); bb.gr=ctx.createGain(); bb.gl.gain.value=0.05; bb.gr.gain.value=0.05;
    const splitter = ctx.createChannelMerger(2);
    bb.l.connect(bb.gl).connect(splitter,0,0);
    bb.r.connect(bb.gr).connect(splitter,0,1);
    splitter.connect(master);
    bb.l.start(); bb.r.start();
  }
  function bbStop(){
    if(!bb.on) return; bb.on=false;
    ['l','r'].forEach(k => { if(bb[k]){bb[k].stop();} });
  }

  // ==== Soft taps / ASMR-ish ====
  let asmr={on:false, timer:null};
  function asmrStart(){ if(asmr.on) return; asmr.on=true; asmrTick(); }
  function asmrStop(){ asmr.on=false; if(asmr.timer) clearTimeout(asmr.timer); }
  function asmrTick(){
    if(!asmr.on) return;
    tap();
    const base = 1/Math.max(0.01, v('#asmrRate'));
    const r = v('#asmrRand');
    const next = (base * (0.5 + Math.random()*r + (1-r)));
    asmr.timer = setTimeout(asmrTick, next*1000);
  }
  function tap(){
    const n = noiseNode('white', 0.3);
    const lp = ctx.createBiquadFilter(); lp.type='lowpass'; lp.frequency.value=1800; lp.Q.value=0.2;
    const g = ctx.createGain(); g.gain.value=0.0001;
    const t = ctx.currentTime;
    g.gain.exponentialRampToValueAtTime(0.08 + Math.random()*0.06, t+0.003);
    g.gain.exponentialRampToValueAtTime(0.0001, t+0.06+Math.random()*0.02);
    n.connect(lp).connect(g).connect(master);
    setTimeout(()=>{n.stop(); lp.disconnect(); g.disconnect();}, 90);
  }

  // ==== Utilities ====
  function noiseNode(type='white', amp=0.5){
    const length = Math.floor(ctx.sampleRate*2);
    const buf = ctx.createBuffer(1,length,ctx.sampleRate);
    const data = buf.getChannelData(0);
    for(let i=0;i<length;i++){
      data[i] = (Math.random()*2-1) * (type==='white'?1:1); // extendable
    }
    const src = ctx.createBufferSource(); src.buffer = buf; src.loop = true;
    const g = ctx.createGain(); g.gain.value = amp;
    src.connect(g);
    src.start();
    // return object exposing stop/disconnect
    return new Proxy(g,{
      get:(t,prop)=> prop==='stop' ? (()=>src.stop()) : t[prop]
    });
  }

  // ==== Wiring UI ====
  $('#startCtx').onclick = () => { initCtx(); $('#limLight').textContent='on'; };
  $('#stopAll').onclick = () => { ['assr','rough','groove','mmn','bb','asmr'].forEach(k=>stopModule(k)); };
  function stopModule(name){
    if(!ctx) return;
    ({assr:assrStop, rough:roughStop, groove:grooveStop, mmn:mmnStop, bb:bbStop, asmr:asmrStop}[name] || (()=>{}))();
    // Also turn off switches
    const map={assr:'#assrOn', rough:'#roughOn', groove:'#grooveOn', mmn:'#mmnOn', bb:'#bbOn', asmr:'#asmrOn'};
    if(map[name]) $(map[name]).checked=false;
  }

  $('#vol').oninput = e => { if(!ctx) return; master.gain.value = +e.target.value; $('#volVal').textContent=e.target.value; };

  // ASSR controls
  $('#assrOn').onchange = e => { if(!ctx){initCtx();} e.target.checked ? (assr.rate=v('#assrRate'),assr.pw=v('#assrPW')/1000,assrStart()) : assrStop(); };
  const updAssr = () => { $('#assrRateVal').textContent=$('#assrRate').value; $('#assrPWVal').textContent=$('#assrPW').value;
    assr.rate = v('#assrRate'); assr.pw = v('#assrPW')/1000; };
  ['#assrRate','#assrPW'].forEach(id => $(id).oninput = updAssr);

  // Roughness controls
  $('#roughOn').onchange = e => { if(!ctx){initCtx();} e.target.checked ? roughStart() : roughStop(); };
  $('#roughRate').oninput = e => { $('#roughRateVal').textContent=e.target.value; if(rough.lfo) rough.lfo.frequency.value = +e.target.value; };
  $('#roughBurst').oninput = e => $('#roughBurstVal').textContent=e.target.value;
  $('#roughPing').onclick = () => { if(!ctx){initCtx();} roughBurst(+$('#roughBurst').value); };

  // Groove
  $('#grooveOn').onchange = e => { if(!ctx){initCtx();} groove.bpm=v('#grooveBPM'); groove.sync=v('#grooveSync'); e.target.checked?grooveStart():grooveStop(); };
  $('#grooveBPM').oninput = e => { $('#grooveBPMVal').textContent=e.target.value; groove.bpm=+e.target.value; };
  $('#grooveSync').oninput = e => { $('#grooveSyncVal').textContent=parseFloat(e.target.value).toFixed(2); groove.sync=+e.target.value; };

  // MMN
  $('#mmnOn').onchange = e => { if(!ctx){initCtx();} e.target.checked?mmnStart():mmnStop(); };
  ['#mmnStd','#mmnDelta','#mmnProb','#mmnISI'].forEach(id=>{
    $(id).oninput = e => { $(id+'Val').textContent=e.target.value; };
  });

  // Binaural beats
  $('#bbOn').onchange = e => { if(!ctx){initCtx();} e.target.checked?bbStart():bbStop(); };
  $('#bbCar').oninput = e => { $('#bbCarVal').textContent=e.target.value; if(bb.l&&bb.r){ const beat=v('#bbBeat'); bb.l.frequency.value=+e.target.value - beat/2; bb.r.frequency.value=+e.target.value + beat/2; } };
  $('#bbBeat').oninput = e => { $('#bbBeatVal').textContent=parseFloat(e.target.value).toFixed(1); if(bb.l&&bb.r){ const car=v('#bbCar'); bb.l.frequency.value=car - +e.target.value/2; bb.r.frequency.value=car + +e.target.value/2; } };

  // ASMR taps
  $('#asmrOn').onchange = e => { if(!ctx){initCtx();} e.target.checked?asmrStart():asmrStop(); };
  ['#asmrRate','#asmrRand'].forEach(id=> $(id).oninput = e => { $(id+'Val').textContent=e.target.value; });

  // Presets
  $('#presetFocus').onclick = ()=>{
    initCtx();
    $('#vol').value=0.06; $('#volVal').textContent='0.06'; master.gain.value=0.06;
    // groove on medium syncopation
    $('#grooveBPM').value=110; $('#grooveBPMVal').textContent='110'; groove.bpm=110;
    $('#grooveSync').value=0.5; $('#grooveSyncVal').textContent='0.50'; groove.sync=0.5;
    $('#grooveOn').checked=true; grooveStart();
    // others off
    ['assr','rough','mmn','bb','asmr'].forEach(stopModule);
  };
  $('#presetArousal').onclick = ()=>{
    initCtx();
    $('#vol').value=0.03; $('#volVal').textContent='0.03'; master.gain.value=0.03;
    // brief 40 Hz + short rough burst
    $('#assrRate').value=40; $('#assrPW').value=3; updAssr();
    $('#assrOn').checked=true; assrStart();
    setTimeout(()=>roughBurst(200), 300);
    setTimeout(()=>{ $('#assrOn').checked=false; assrStop(); }, 5000);
  };
  $('#presetRelax').onclick = ()=>{
    initCtx();
    $('#vol').value=0.04; $('#volVal').textContent='0.04'; master.gain.value=0.04;
    // low-level 6 Hz BB + soft taps slow
    $('#bbCar').value=300; $('#bbBeat').value=6; $('#bbCarVal').textContent='300'; $('#bbBeatVal').textContent='6.0';
    $('#bbOn').checked=true; bbStart();
    $('#asmrRate').value=0.6; $('#asmrRand').value=0.5; $('#asmrRateVal').textContent='0.6'; $('#asmrRandVal').textContent='0.5';
    $('#asmrOn').checked=true; asmrStart();
    // others off
    ['assr','rough','groove','mmn'].forEach(stopModule);
  };

})();
</script>
</body>
</html>