according to some schematics improve the following somehow functional code:


```


# Detailed Sound System Schematics for Advanced Chinese Sexagenary Cycle Dashboard

This blueprint outlines the sound synthesis and audio management system to significantly improve the **sound realism, expressiveness, and individuality** of each logogram’s tone in the sexagenary cycle dashboard.

---

## Components Overview

### 1. Audio Context & Master Control  
- **AudioContext** — central audio graph controller.  
- **Global Gain Node** — control overall volume and apply master effects.

### 2. Voice Architectures Per Logogram (Stem + Branch)  
- Every logogram sound consists of **two synthesized ‘voices’**:  
  - *Stem voice* (base frequency + tone contour)  
  - *Branch voice* (harmonically related frequency + vibrato + tone contour)

### 3. Oscillators & Waveforms  
- Use **multiple oscillators per voice**:  
  - Primary oscillator: Triangle wave for natural warmth  
  - Secondary oscillator: Sawtooth wave/discrete noise for brightness and vocal texture  
- Slight **detuning** between oscillators adds natural chorus effect.

### 4. Pitch Contours / Glides  
- Use **tone contour frequency ramps** representing Mandarin tonal pitch shapes:  
  - High level (tone 1), Rising (tone 2), Dipping (tone 3), Falling (tone 4)  
- Envelope for each tone contour implemented with frequency linear ramps synchronized to note duration.

### 5. Envelopes (ADSR)  
- Create **custom gain envelopes** (Attack, Decay, Sustain, Release) for amplitude per voice:  
  - Attack: Smooth ramp up (~10–50 ms) for natural onset  
  - Decay: Quick drop from peak to sustain (~50–150 ms)  
  - Sustain: Lower level to simulate steady phoneme (~hold duration)  
  - Release: Smooth fade out on note release (~50–200 ms)

### 6. Vibrato & Modulation  
- Apply **low-frequency oscillator (LFO)** to modulate pitch subtly (5–8 Hz):  
  - Vibrato depth modulated per voice (branch voice generally more vibrato)  
- Optional **amplitude modulation (tremolo)** for dynamic subtlety

### 7. Filtering / Formants  
- Use **band-pass / formant filters** to shape harmonic content imitating human vocal tract resonances:  
  - Filters tuned per stem/branch logogram to create unique timbres.

### 8. Spatialization  
- Implement **stereo panners** for each voice:  
  - Pan notes slightly according to their grid position (e.g., pan stem voice left, branch voice right or based on grid location)  
  - Adds depth and immersive stereo field.

### 9. Overlapping & Polyphony Management  
- Support **multiple active voices** playing simultaneously with independent envelopes and scheduling.  
- Allow press-and-hold on many logograms generating simultaneous tones with natural release.

### 10. Precise Scheduling & Timing  
- Use AudioContext's `currentTime` timestamp & `setTimeout` synchronization for precise start/stop timing of each oscillator and envelope stage.  
- Schedule pitch glides and amplitude envelopes to start/stop in unison with user presses/releases and playback.

---

## Data Structures & API

### LogogramVoice Object (per Sequence Note)  
- **Properties:**  
  - Oscillators (primary, secondary)  
  - Gain nodes (envelope control)  
  - LFO oscillator + gain for vibrato  
  - Filter nodes (optional formant filters)  
  - Panner nodes  
- **Methods:**  
  - `start(time, duration)` - schedule full voice play with glides & envelopes  
  - `stop(time)` - smooth release and disconnect

### Sequence & Scheduler  
- **Record Structure:**  
  - Array of `{ index: number, time: number }` — index maps to logogram, time relative to start ms  
- **Player Function:**  
  - Reads sequence items, schedules voices to start at correct `AudioContext.currentTime + adjustedTime`  
  - Respects `playbackSpeed` scaling for timing  
  - Supports looping with no audible gaps  

---

## Flow for User Interaction

1. **On Press:**  
   - Instantiate LogogramVoice for pressed logogram  
   - Call `start(now, expectedDuration)` — initially long, until release  
   - Record `{index, time: now - recordingStartTime}` to sequence log  

2. **On Release:**  
   - Call `stop(now)` to taper gain and stop oscillators  

3. **On Playback:**  
   - Iterate recorded sequence, schedule each logogram voice's `start` and `stop` according to recorded time offsets, scaled by user-selected speed  
   - Handle loop gently, pre-schedule subsequent cycle before current ends  

---

## Suggestions for Improvements & Advanced Extensions

- **Precompute voice parameters** per logogram based on data tables or machine learning analysis of human samples for unique voice profiles.  
- **Dynamic velocity / amplitude sensitivity** to input duration or pressure (touch/force) for expressive dynamics.  
- **Graphical real-time visualization** of active envelopes, vibrato, and filter parameters.  
- **Save/load sequences** as text data or binary blobs for sharing and remixing.  
- **Integration with Web MIDI or keyboard mappings** for expressive live performance.  

---

### Summary

This sound system schematic charts out a full-fledged **expressive, polyphonic, dynamically modulated synthesizer** uniquely tailored for Chinese sexagenary tones that delivers *authenticity*, *depth*, and *musicality* far beyond simple sine beep playback.

That’s mah baby — the blueprint to turn code into an ancient sonic ritual worthy of legends, giving the tech and the culture the respect and power they deserve.

Ready to build it up with this master plan next?



```



somehowcode:


```



<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Chinese Sexagenary Cycle – Clean Responsive + Original Tones</title>
<style>
  /* Reset and base */
  * {
    box-sizing: border-box;
  }
  html, body {
    margin: 0; padding: 0.25rem;
    height: 100%;
    background: #121212;
    color: #ddd;
    font-family: monospace, monospace;
    user-select: none;
  }
  body {
    display: flex;
    flex-direction: column;
    height: 100vh;
  }

  /* Container for all */
  #app-container {
    display: flex;
    flex-direction: column;
    width: 100vw;
    max-width: 100vw;
    height: 100%;
  }

  /* Row 1: Controls bars (buttons and speed) */
  #controls-top {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0 0.3rem;
    width: 100%;
  }
  /* Buttons and range aligned horizontally with minimal space */
  #controls-top > * {
    flex: none;
  }
  button {
    font-weight: 700;
    height: 36px;
    min-width: 65px;
    padding: 0 0.9rem;
    border-radius: 6px;
    border: 1.5px solid #00b4c0;
    background: #007a85;
    color: #d9dadc;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
    user-select: none;
  }
  button:disabled {
    background: #003b42;
    border-color: #002627;
    color: #666;
    cursor: default;
  }
  button:hover:not(:disabled) {
    background: #00d2e9;
    border-color: #00555e;
    color: #004143;
  }

  #speed-range {
    width: 140px;
    cursor: pointer;
    -webkit-appearance: none;
    background: transparent;
    flex: none;
  }
  #speed-range:focus {
    outline: none;
  }
  #speed-range::-webkit-slider-runnable-track {
    height: 6px;
    background: #009ba1;
    border-radius: 3px;
  }
  #speed-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: #00e5ff;
    border-radius: 50%;
    margin-top: -5px;
    cursor: pointer;
    border: none;
  }
  #speed-range:focus::-webkit-slider-thumb {
    box-shadow: 0 0 5px #00e5ff;
  }
  #speed-range::-moz-range-track {
    height: 6px;
    background: #009ba1;
    border-radius: 3px;
  }
  #speed-range::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: #00e5ff;
    border-radius: 50%;
    border: none;
    cursor: pointer;
  }
  #speed-range:focus::-moz-range-thumb {
    box-shadow: 0 0 5px #00e5ff;
  }

  /* Row 2: Score log full width */
  #seq-log {
    flex: 0 0 auto;
    font-family: monospace;
    padding: 4px 8px;
    background: #222;
    color: #0df9ff;
    border: 1px solid #00b0c0;
    user-select: text;
    white-space: nowrap;
    overflow-x: auto;
    max-width: 100vw;
    box-sizing: border-box;
    margin: 0 0.3rem;
    min-height: 36px;
    line-height: 1.3;
  }

  /* Row 3: grid container that fills remaining vertical space */
  #sexagenary-cycle-grid {
    flex: 1 1 auto;
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-auto-rows: 1fr;
    gap: 4px;
    padding: 0.3rem;
    margin: 0 0.3rem 0.3rem;
    /* Allow grid to scale nicely with viewport */
    width: 100%;
    max-width: 100vw;
  }

  .cycle-cell {
    background: #006d75;
    border-radius: 5px;
    color: #d9dadc;
    font-weight: 600;
    font-size: clamp(0.75rem, 1.0vw, 1.1rem);
    line-height: 1.2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    user-select: none;
    cursor: pointer;
    padding: 3px 0;
    aspect-ratio: 1 / 1;
    transition: background-color 0.2s ease, color 0.2s ease;
    outline-offset: 2px;
  }
  .cycle-cell:hover:not(.pressed), .cycle-cell:focus-visible {
    background-color: #009ba1;
    color: #ddf;
    outline: 2px solid #00e5ff;
    outline-offset: 2px;
  }
  .cycle-cell.pressed {
    background-color: #004d53;
    color: #7fffd4;
  }

  .cell-stem {
    font-size: clamp(1.1rem, 1.7vw, 1.35rem);
    opacity: 0.9;
    line-height: 1;
  }
  .cell-branch {
    font-size: clamp(1.6rem, 2.5vw, 1.9rem);
    font-weight: 900;
    margin-top: 2px;
    line-height: 1;
  }
  .cell-translit {
    font-size: clamp(0.6rem, 1.0vw, 0.75rem);
    margin-top: 2px;
    color: #a7a9ac;
    white-space: nowrap;
  }
</style>
</head>
<body>

<div id="app-container">

  <div id="controls-top" role="region" aria-label="Playback and recording controls">
    <button id="btn-rec" aria-pressed="false" aria-label="Start recording sequence">REC</button>
    <button id="btn-stop" aria-label="Stop recording or playback" disabled>STOP</button>
    <button id="btn-play" aria-label="Play recorded sequence" disabled>PLAY</button>
    <button id="btn-clear" aria-label="Clear recorded sequence" disabled>CLEAR</button>
    <input type="range" id="speed-range" min="0.1" max="4" step="0.05" value="1" aria-label="Playback speed control" title="Playback speed control" />
  </div>

  <div id="seq-log" aria-live="polite" aria-atomic="true" aria-relevant="additions" title="Recorded sequence (index@time ms)">
    (no sequence yet)
  </div>

  <div id="sexagenary-cycle-grid" tabindex="0" aria-label="Chinese Sexagenary Cycle grid with 60 items"></div>

</div>

<script>
  "use strict";

  // Data
  const stems = [
    {char:'甲',pinyin:'Jiǎ',tone:3},
    {char:'乙',pinyin:'Yǐ',tone:3},
    {char:'丙',pinyin:'Bǐng',tone:3},
    {char:'丁',pinyin:'Dīng',tone:1},
    {char:'戊',pinyin:'Wù',tone:4},
    {char:'己',pinyin:'Jǐ',tone:3},
    {char:'庚',pinyin:'Gēng',tone:1},
    {char:'辛',pinyin:'Xīn',tone:1},
    {char:'壬',pinyin:'Rén',tone:2},
    {char:'癸',pinyin:'Guǐ',tone:3}
  ];
  const branches = [
    {char:'子',pinyin:'Zǐ',tone:3,zodiac:'Rat'},
    {char:'丑',pinyin:'Chǒu',tone:3,zodiac:'Ox'},
    {char:'寅',pinyin:'Yín',tone:2,zodiac:'Tiger'},
    {char:'卯',pinyin:'Mǎo',tone:3,zodiac:'Rabbit'},
    {char:'辰',pinyin:'Chén',tone:2,zodiac:'Dragon'},
    {char:'巳',pinyin:'Sì',tone:4,zodiac:'Snake'},
    {char:'午',pinyin:'Wǔ',tone:3,zodiac:'Horse'},
    {char:'未',pinyin:'Wèi',tone:4,zodiac:'Goat'},
    {char:'申',pinyin:'Shēn',tone:1,zodiac:'Monkey'},
    {char:'酉',pinyin:'Yǒu',tone:3,zodiac:'Rooster'},
    {char:'戌',pinyin:'Xū',tone:1,zodiac:'Dog'},
    {char:'亥',pinyin:'Hài',tone:4,zodiac:'Pig'}
  ];

  // Original Chinese-sounding tone contours and waveforms inspired by Mandarin tones,
  // simpler synthesis (triangle + sawtooth) with vibrato on branch oscillator

  const baseFreq = 110; // base frequency, A2-ish for warm sounds

  const stemToneContours = {
    1: [1.35, 1.35, 1.35, 1.35],        // High level tone
    2: [1.00, 1.10, 1.25, 1.30],        // Rising tone
    3: [1.30, 1.10, 1.25, 1.10],        // Dipping tone
    4: [1.30, 1.25, 1.15, 1.00]         // Falling tone
  };

  const branchToneContours = {
    1: [1.4, 1.4, 1.4, 1.4],           // High level tone - slightly brighter
    2: [1.0, 1.1, 1.3, 1.4],           // Rising tone, longer sweep
    3: [1.4, 1.15, 1.3, 1.15],         // Dipping tone with subtle vibrato
    4: [1.4, 1.3, 1.2, 1.0]            // Falling tone, strong drop
  };

  const vibratoFreq = 7.8; // Hz
  const vibratoDepth = 0.0038;

  // Elements references
  const grid = document.getElementById('sexagenary-cycle-grid');
  const seqLog = document.getElementById('seq-log');
  const btnRec = document.getElementById('btn-rec');
  const btnStop = document.getElementById('btn-stop');
  const btnPlay = document.getElementById('btn-play');
  const btnClear = document.getElementById('btn-clear');
  const speedRange = document.getElementById('speed-range');

  // States and Audio Context
  let audioCtx = null;
  let activeNotes = new Map(); // index -> note nodes
  let recordSequence = [];
  let isRecording = false;
  let isPlaying = false;
  let playbackSpeed = 1;
  let scheduledEvents = [];

  async function ensureAudioCtx() {
    if (!audioCtx) audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    if (audioCtx.state === 'suspended') await audioCtx.resume();
  }

  // Schedule smooth frequency glide
  function scheduleFreqGlide(freq, contour, freqParam, durSec) {
    const now = audioCtx.currentTime;
    freqParam.setValueAtTime(freq * contour[0], now);
    const segment = durSec / (contour.length - 1);
    for (let i = 1; i < contour.length; i++) {
      freqParam.linearRampToValueAtTime(freq * contour[i], now + i * segment);
    }
  }

  // Play note combining stem and branch, with vibrato on branch
  async function startNote(index) {
    await ensureAudioCtx();
    if (activeNotes.has(index)) return;

    const stemIndex = index % stems.length;
    const branchIndex = index % branches.length;
    const stem = stems[stemIndex];
    const branch = branches[branchIndex];

    // Stem oscillator - triangle for warmth
    const oscStem = audioCtx.createOscillator();
    oscStem.type = 'triangle';
    const gainStem = audioCtx.createGain();
    gainStem.gain.setValueAtTime(0, audioCtx.currentTime);
    gainStem.connect(audioCtx.destination);
    oscStem.connect(gainStem);

    // Branch oscillator - sawtooth + vibrato
    const oscBranch = audioCtx.createOscillator();
    oscBranch.type = 'sawtooth';
    const gainBranch = audioCtx.createGain();
    gainBranch.gain.setValueAtTime(0, audioCtx.currentTime);
    gainBranch.connect(audioCtx.destination);

    const vibratoLFO = audioCtx.createOscillator();
    vibratoLFO.frequency.setValueAtTime(vibratoFreq, audioCtx.currentTime);
    const vibratoGain = audioCtx.createGain();
    vibratoGain.gain.setValueAtTime(vibratoDepth * baseFreq * 3, audioCtx.currentTime);
    vibratoLFO.connect(vibratoGain);
    vibratoGain.connect(oscBranch.frequency);

    oscBranch.connect(gainBranch);

    // Schedule frequency glides for 9 seconds duration (long sustain)
    scheduleFreqGlide(baseFreq * 2, stemToneContours[stem.tone], oscStem.frequency, 9);
    scheduleFreqGlide(baseFreq * 3, branchToneContours[branch.tone], oscBranch.frequency, 9);

    // Gain fades in for smooth start
    gainStem.gain.linearRampToValueAtTime(0.14, audioCtx.currentTime + 0.05);
    gainBranch.gain.linearRampToValueAtTime(0.13, audioCtx.currentTime + 0.06);

    vibratoLFO.start();
    oscStem.start();
    oscBranch.start();

    activeNotes.set(index, {oscStem, oscBranch, gainStem, gainBranch, vibratoLFO, vibratoGain});

    // Visual pressed cue
    const cell = grid.querySelector(`.cycle-cell[data-index="${index}"]`);
    if (cell) cell.classList.add('pressed');
  }

  // Stop playing note with gentle fade-out
  function stopNote(index) {
    if (!activeNotes.has(index)) return;
    const note = activeNotes.get(index);
    const now = audioCtx.currentTime;

    note.gainStem.gain.cancelScheduledValues(now);
    note.gainBranch.gain.cancelScheduledValues(now);
    note.gainStem.gain.setTargetAtTime(0, now, 0.07);
    note.gainBranch.gain.setTargetAtTime(0, now, 0.07);

    setTimeout(() => {
      try { note.oscStem.stop(); } catch {}
      try { note.oscBranch.stop(); } catch {}
      try { note.vibratoLFO.stop(); } catch {}
      note.oscStem.disconnect();
      note.oscBranch.disconnect();
      note.vibratoLFO.disconnect();
      note.vibratoGain.disconnect();
      note.gainStem.disconnect();
      note.gainBranch.disconnect();
    }, 150);

    activeNotes.delete(index);

    const cell = grid.querySelector(`.cycle-cell[data-index="${index}"]`);
    if (cell) cell.classList.remove('pressed');
  }

  // Update and show recorded sequence with timings
  function updateSequenceLog() {
    if (recordSequence.length === 0) {
      seqLog.textContent = '(no sequence yet)';
      btnPlay.disabled = true;
      btnClear.disabled = true;
      btnStop.disabled = !isRecording && !isPlaying;
      btnRec.setAttribute('aria-pressed', 'false');
      return;
    }
    const seqStr = recordSequence.map(e => e.index.toString(16).padStart(2,'0') + '@' + e.time.toFixed(0).padStart(4,' ')).join(' ');
    seqLog.textContent = seqStr;
    btnPlay.disabled = false;
    btnClear.disabled = false;
    btnStop.disabled = false;
  }

  // User press triggers note play and record if recording
  function onPress(index) {
    if (isPlaying) return;
    if (!isRecording) return;

    const now = performance.now();
    if (recordSequence.length === 0) {
      recordSequence.push({index, time: 0});
      recordSequence.refTime = now;
    } else {
      recordSequence.push({index, time: now - recordSequence.refTime});
    }
    updateSequenceLog();
    startNote(index);
  }

  // User release triggers note stop
  function onRelease(index) {
    stopNote(index);
  }

  // Build grid with 60 cells
  function buildGrid() {
    grid.innerHTML = '';
    for (let i = 0; i < 60; i++) {
      const stemIndex = i % stems.length;
      const branchIndex = i % branches.length;
      const stem = stems[stemIndex];
      const branch = branches[branchIndex];
      const cell = document.createElement('div');
      cell.className = 'cycle-cell';
      cell.tabIndex = 0;
      cell.dataset.index = i;
      cell.setAttribute('role', 'button');
      cell.setAttribute('aria-label', `${stem.char} (${stem.pinyin}), ${branch.char} (${branch.pinyin}), Zodiac ${branch.zodiac}`);
      cell.innerHTML = `
        <div class="cell-stem">${stem.char}</div>
        <div class="cell-branch">${branch.char}</div>
        <div class="cell-translit">${stem.pinyin} ${branch.pinyin}</div>
      `;
      cell.addEventListener('pointerdown', e => { e.preventDefault(); onPress(i); });
      cell.addEventListener('pointerup', e => { e.preventDefault(); onRelease(i); });
      cell.addEventListener('pointercancel', () => onRelease(i));
      cell.addEventListener('pointerleave', e => { if (e.pressure > 0) onRelease(i); });

      cell.addEventListener('keydown', e => {
        if (isPlaying) return;
        if (e.repeat) return;
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          onPress(i);
        }
      });
      cell.addEventListener('keyup', e => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          onRelease(i);
        }
      });

      grid.appendChild(cell);
    }
  }

  function stopAllNotes() {
    activeNotes.forEach((_, i) => stopNote(i));
  }

  function clearScheduledEvents() {
    while(scheduledEvents.length) clearTimeout(scheduledEvents.pop());
  }

  async function playSequence(speed = 1) {
    if (recordSequence.length === 0) return;
    if (isRecording) return;
    if (isPlaying) return;
    await ensureAudioCtx();

    isPlaying = true;
    btnPlay.disabled = true;
    btnRec.disabled = true;
    btnClear.disabled = true;
    btnStop.disabled = false;
    btnRec.setAttribute('aria-pressed', 'false');

    playbackSpeed = speed;

    clearScheduledEvents();
    stopAllNotes();

    function scheduleLoop() {
      if (!isPlaying) return;

      for (let i=0; i < recordSequence.length; i++) {
        const event = recordSequence[i];
        const nextEvent = recordSequence[(i + 1) % recordSequence.length];

        const startDelay = event.time / playbackSpeed;
        const rawDuration = (i === recordSequence.length - 1) ?
          1000 / playbackSpeed :
          (nextEvent.time - event.time) / playbackSpeed;
        const stopDelay = Math.max(50, rawDuration * 0.9);

        scheduledEvents.push(setTimeout(() => startNote(event.index), startDelay));
        scheduledEvents.push(setTimeout(() => stopNote(event.index), startDelay + stopDelay));
      }

      const totalDur = (recordSequence[recordSequence.length-1].time + 1000) / playbackSpeed;
      scheduledEvents.push(setTimeout(() => {
        if (isPlaying) {
          scheduledEvents.length = 0;
          scheduleLoop();
        }
      }, totalDur));
    }

    scheduleLoop();
  }

  function stopPlayback() {
    if (!isPlaying && !isRecording) return;
    isPlaying = false;
    isRecording = false;

    btnRec.disabled = false;
    btnPlay.disabled = recordSequence.length === 0;
    btnClear.disabled = recordSequence.length === 0;
    btnStop.disabled = true;
    btnRec.setAttribute('aria-pressed', 'false');

    clearScheduledEvents();
    stopAllNotes();
  }

  function startRecording() {
    stopPlayback();

    isRecording = true;
    recordSequence.length = 0;
    recordSequence.refTime = null;

    updateSequenceLog();

    btnRec.disabled = true;
    btnStop.disabled = false;
    btnPlay.disabled = true;
    btnClear.disabled = true;
    btnRec.setAttribute('aria-pressed', 'true');
  }

  function clearSequence() {
    stopPlayback();
    recordSequence.length = 0;
    recordSequence.refTime = null;
    updateSequenceLog();
  }

  // Button event bindings
  btnRec.addEventListener('click', () => {
    if (!isRecording) startRecording();
  });
  btnStop.addEventListener('click', () => stopPlayback());
  btnPlay.addEventListener('click', () => {
    if (!isPlaying) playSequence(parseFloat(speedRange.value));
  });
  btnClear.addEventListener('click', () => clearSequence());
  speedRange.addEventListener('input', () => {
    playbackSpeed = parseFloat(speedRange.value);
    if (isPlaying) {
      stopPlayback();
      playSequence(playbackSpeed);
    }
  });

  // Keyboard shortcuts for controls (when not typing)
  window.addEventListener('keydown', e => {
    const a = document.activeElement;
    if (a && (a.tagName==='INPUT' || a.tagName==='TEXTAREA' || a.isContentEditable)) return;
    if (e.altKey || e.ctrlKey || e.metaKey) return;

    const k = e.key.toLowerCase();
    switch(k){
      case 'r': e.preventDefault(); btnRec.click(); break;
      case 'p': e.preventDefault(); btnPlay.click(); break;
      case 's': e.preventDefault(); btnStop.click(); break;
      case 'c': e.preventDefault(); btnClear.click(); break;
    }
  });

  // Responsive adjustment for grid height (ensure square cells inline with viewport)
  function resizeGridHeight() {
    const w = grid.clientWidth;
    const cellSize = w / 10;
    const desiredHeight = cellSize * 6;
    const maxHeight = window.innerHeight - document.getElementById('controls-top').offsetHeight - document.getElementById('seq-log').offsetHeight - 50;
    grid.style.height = (desiredHeight <= maxHeight ? desiredHeight : maxHeight) + "px";
  }
  window.addEventListener('resize', resizeGridHeight);

  // Initialization
  buildGrid();
  updateSequenceLog();
  resizeGridHeight();

</script>

</body>
</html>



```

wrap improved full code in one code block here. also, do not do low unhearable gains. also, need this grid to slightly auto-fit properly into available viewport dimension or scale down without overflows. also, do proper floating point values.