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Arpeggiator pad · ling-3.0-flash
Using the pre-provided tone.min.js (global Tone), build a clickable pentatonic pad grid that triggers a synth voice with reverb, plus a play/stop button that runs an arpeggiator sequence at an adjustable tempo. All sound synthesized, no audio files.
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user
Using the pre-provided tone.min.js (global Tone), build a clickable pentatonic pad grid that triggers a synth voice with reverb, plus a play/stop button that runs an arpeggiator sequence at an adjustable tempo. All sound synthesized, no audio files.
assistant
thinking
The user wants me to build a single-page web app with: 1. A clickable pentatonic pad grid that triggers a synth voice with reverb 2. A play/stop button that runs an arpeggiator sequence at an adjustable tempo 3. All sound synthesized, no audio files 4. Uses tone.min.js (global Tone) 5. All in one index.html file Let me first check what's in the current directory and if tone.min.js exists.
Let me check the current directory and then build the app.
→ bash
{"command":"ls /tmp/ws/"}toolResult
tone.min.js
assistant
thinking
Good, tone.min.js is present. Now I need to build a single-page web app with:
1. A pentatonic pad grid (clickable pads that trigger synth voices with reverb)
2. A play/stop button for an arpeggiator sequence
3. Adjustable tempo control
4. All synthesized with Tone.js
Let me design this:
- Pentatonic scale: C, D, E, G, A (or I could use a few octaves)
- Grid layout: maybe 5 rows (pentatonic notes) x 4 columns (octaves or patterns)
- Synth: PolySynth or Synth with reverb
- Arpeggiator: use Tone.Part or Tone.Sequence to play notes in sequence
- Tempo: a slider or input to control BPM
Let me think about the pentatonic grid more carefully. A pentatonic pad grid could be:
- 5 pentatonic notes × multiple octaves or pattern steps
- Each pad lights up when pressed
- Clicking plays the note with reverb
For the arpeggiator:
- It could play a sequence of notes from the pentatonic scale
- Adjustable tempo via a slider
- Play/stop button toggles it
Let me design the UI:
- Dark theme with glowing pads
- Each pad shows the note name
- When playing arpeggio, pads light up in sequence
- Tempo slider
- Play/Stop button
Let me write the code:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Pentatonic Pad Grid</title>
<style>
/* styles */
</style>
</head>
<body>
<!-- grid, controls -->
<script src="tone.min.js"></script>
<script>
// Tone.js code
</script>
</body>
</html>
```
Let me think about the pentatonic scale. I'll use A minor pentatonic: A, C, D, E, G across multiple octaves. Or C major pentatonic: C, D, E, G, A.
Let me use C major pentatonic across 2 octaves for a nice grid:
- C3, D3, E3, G3, A3 (octave 1)
- C4, D4, E4, G4, A4 (octave 2)
That gives a 5×2 grid or I could do a 5×5 grid with more octaves.
Actually, let me think of it as a more interesting grid. Maybe 5 pentatonic notes × 4 pattern steps (like a 5×4 grid), where each column represents a step in the arpeggio pattern. When you click a pad, it plays that note. When arpeggiator runs, it steps through columns sequentially.
Let me go with a 5×5 grid: 5 pentatonic notes (C, D, E, G, A) × 5 octaves (C3-C6 range). Actually that might be too many. Let me do 5 notes × 4 octaves = 20 pads.
For the arpeggiator, I'll use a Tone.Sequence or Tone.Part that plays notes in a pattern. The pattern could be configurable - maybe it plays through the pentatonic notes in sequence, or it could follow the grid columns.
Let me keep it simpler and more fun:
- 5×5 grid: 5 pentatonic notes × 5 octaves
- Each pad is clickable, plays note with reverb
- Arpeggiator plays a sequence through the grid
- Tempo slider
- Play/Stop button
Let me code this up now.
For the arpeggiator pattern, I'll have it cycle through a sequence of notes. The sequence could be: it plays notes from the grid in a pattern, maybe going up and down the pentatonic scale.
Let me think about the arpeggiator more carefully. I'll use Tone.PolySynth with reverb, and Tone.Sequence for the arpeggio.
Here's my plan:
```javascript
// Setup
const synth = new Tone.PolySynth(Tone.Synth).toDestination();
const reverb = new Tone.Reverb(4).toDestination();
synth.connect(reverb);
// Pentatonic notes
const pentatonic = ['C3', 'D3', 'E3', 'G3', 'A3', 'C4', 'D4', 'E4', 'G4', 'A4', 'C5', 'D5', 'E5', 'G5', 'A5'];
// Grid: 5 notes × 3 octaves = 15 pads
// Or 5 notes × 4 octaves = 20 pads
// Arpeggiator sequence
// A sequence of note indices that the arpeggiator plays
```
Actually, let me make the grid more visual and interesting. Let me do a 5×5 grid where:
- Rows = pentatonic scale degrees (C, D, E, G, A)
- Columns = octaves (3, 4, 5, 6, 7) — wait that's too high
Let me do:
- Rows = pentatonic notes (C, D, E, G, A)
- Columns = octaves (3, 4, 5, 6) — 4 octaves
That's 5×4 = 20 pads.
For the arpeggiator, I'll define a pattern like [0, 2, 4, 2, 0, 3, 1, 3, ...] where each number is an index into the 20 pads (or just the 5 notes).
Actually, let me simplify the arpeggiator: it plays a sequence of notes from the pentatonic scale at the current tempo. The pattern can be a simple ascending/descending pattern or something more interesting.
Let me write the full code now.
I want to make it visually appealing with a dark theme, glowing pads, smooth animations, etc.
Let me think about the grid layout more carefully. I'll do 5 rows (pentatonic notes) × 5 columns (octaves C3 through C6... wait that's 4 octaves). Let me do 5×5 = 25 pads.
Pentatonic notes: C, D, E, G, A
Octaves: 3, 4, 5, 6 — that's only 4
Let me do 5 rows × 4 columns = 20 pads, or add an extra column for something else.
Actually, let me just do 5×5 with notes C3, D3, E3, G3, A3 in row 1, C4, D4, E4, G4, A4 in row 2, etc. up to C6, D6, E6, G6, A6. That's 5 rows × 5 columns = 25 pads.
Wait, that's 5 octaves × 5 notes = 25 pads. That's a lot but makes a nice grid.
Hmm, let me reconsider. 5 rows (notes) × 4 columns (octaves) = 20 pads is more manageable.
For the arpeggiator, I'll create a sequence that plays notes from the grid. The pattern could be:
- Ascending through all notes
- Or a predefined pattern
- Or random
Let me make it play a repeating pattern that highlights the pentatonic feel.
OK let me just write the code. I'll make it clean and functional.
Here's my design:
```
PENTATONIC PAD GRID
[C3] [D3] [E3] [G3] [A3] ← Row 0
[C4] [D4] [E4] [G4] [A4] ← Row 1
[C5] [D5] [E5] [G5] [A5] ← Row 2
[C6] [D6] [E6] [G6] [A6] ← Row 3
[Play/Stop] [Tempo: ====o====] BPM: 120
```
The arpeggiator will play a pattern like: 0,2,4,2,0,3,1,3,0,2,4,7,8,10,8,7,5,3,5,0... cycling through the grid.
Let me write the complete code now.
For the visual design, I want:
- Dark background
- Pads that glow when active/hovered/pressed
- Smooth animations
- Clean typography
- The arpeggiator sequence should light up pads as they play
Let me code this up properly.
I need to be careful with Tone.js initialization - it requires user interaction to start the audio context.
Here's my approach:
```javascript
// Global state
let isPlaying = false;
let sequence = null;
let tempo = 120;
// Pentatonic scale notes
const notes = ['C', 'D', 'E', 'G', 'A'];
const octaves = [3, 4, 5, 6]; // 4 octaves
// Create synth and reverb
const synth = new Tone.PolySynth(Tone.Synth, {
oscillator: { type: 'triangle' },
envelope: { attack: 0.01, decay: 0.1, sustain: 0.3, release: 0.5 }
}).toDestination();
const reverb = new Tone.Reverb({ decay: 3, wet: 0.4 }).toDestination();
synth.connect(reverb);
// Grid
const grid = document.getElementById('grid');
// Create pads...
// Arpeggiator pattern
const arpPattern = [0, 2, 4, 7, 9, 7, 4, 2, 0, 3, 5, 7, 10, 7, 5, 3]; // indices into the 20 pads
// Sequence
function startArpeggio() {
sequence = new Tone.Sequence((time, noteIndex) => {
const note = getNoteFromIndex(noteIndex);
synth.triggerAttackRelease(note, '8n', time);
// Light up pad
highlightPad(noteIndex);
}, arpPattern, '8n').start(0);
Tone.getTransport().start();
}
function stopArpeggio() {
if (sequence) {
sequence.stop();
sequence.dispose();
sequence = null;
}
Tone.getTransport().stop();
}
```
Wait, I need to think about the arpeggiator pattern more carefully. The pattern indices should map to the 20 pads (5 notes × 4 octaves).
Let me index the pads as: padIndex = row * numOctaves + col
Where row = note index (0-4 for C,D,E,G,A), col = octave index (0-3 for 3,4,5,6)
So pad 0 = C3, pad 1 = D3, pad 2 = E3, pad 3 = G3, pad 4 = A3
pad 5 = C4, pad 6 = D4, pad 7 = E4, pad 8 = G4, pad 9 = A4
pad 10 = C5, pad 11 = D5, pad 12 = E5, pad 13 = G5, pad 14 = A5
pad 15 = C6, pad 16 = D6, pad 17 = E6, pad 18 = G6, pad 19 = A6
An arpeggio pattern could be:
[0, 2, 4, 7, 9, 12, 14, 17, 19, 17, 14, 12, 9, 7, 4, 2] — going up and down
Or I could make it more interesting by including different octave jumps.
Let me also add a feature where the arpeggiator pattern can be customized, but that might be overcomplicating things. Let me keep it simple but functional.
For the arpeggiator, I'll use a pattern that sounds musical. Let me define it as a sequence of pad indices.
Let me also think about the tempo control. I'll use a range input that shows the BPM value.
Now let me write the complete HTML file.
I want to make this visually impressive. Let me use a dark theme with neon-like glow effects on the pads. Each pad will be a rounded rectangle with the note name displayed.
When a pad is clicked (triggered by user or arpeggiator), it should:
1. Play the note
2. Light up briefly
3. Show a visual pulse
When the arpeggiator is running, the active pad should glow more prominently.
Let me write the complete code now.
Actually, I realize I should think about the reverb setup more carefully. I want the synth to go through reverb. The standard way in Tone.js is:
```javascript
const reverb = new Tone.Reverb(4);
const synth = new Tone.PolySynth(Tone.Synth).connect(reverb);
reverb.toDestination();
```
Or I can use a bus:
```javascript
const reverb = new Tone.Reverb(4).toDestination();
const synth = new Tone.PolySynth(Tone.Synth);
synth.connect(reverb);
```
Both should work. Let me use the second approach.
Also, I should add a delay for more ambience:
```javascript
const delay = new Tone.FeedbackDelay('8n.', 0.3).toDestination();
synth.connect(delay);
synth.connect(reverb);
```
This would give a richer sound. Let me include both reverb and delay.
Let me finalize the design and write the code.
For the arpeggiator, I'll use Tone.Sequence with a pattern. The sequence will fire at the tempo rate and play the next note in the pattern.
Let me also add a volume control and maybe a waveform selector (sine, triangle, square, sawtooth).
Actually, let me keep it focused on what was asked:
1. Clickable pentatonic pad grid with reverb
2. Play/stop arpeggiator
3. Adjustable tempo
I'll add a waveform selector as a nice extra but keep the core features clean.
Let me write the final code:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pentatonic Pad Grid</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
background: #0a0a0f;
color: #e0e0e0;
font-family: 'Segoe UI', system-ui, sans-serif;
min-height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
padding: 20px;
}
h1 {
font-size: 1.8rem;
margin-bottom: 8px;
background: linear-gradient(135deg, #a78bfa, #60a5fa, #34d399);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
}
.subtitle {
color: #666;
font-size: 0.9rem;
margin-bottom: 24px;
}
#grid {
display: grid;
grid-template-columns: repeat(5, 1fr);
gap: 8px;
max-width: 600px;
width: 100%;
margin-bottom: 24px;
}
.pad {
aspect-ratio: 1;
border-radius: 12px;
border: 2px solid rgba(255,255,255,0.08);
background: rgba(255,255,255,0.03);
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
cursor: pointer;
transition: all 0.15s ease;
user-select: none;
position: relative;
overflow: hidden;
}
.pad:hover {
background: rgba(255,255,255,0.08);
border-color: rgba(255,255,255,0.15);
}
.pad.active {
background: rgba(167, 139, 250, 0.3);
border-color: #a78bfa;
box-shadow: 0 0 20px rgba(167, 139, 250, 0.4), inset 0 0 20px rgba(167, 139, 250, 0.1);
}
.pad .note {
font-size: 1.1rem;
font-weight: 600;
color: #ccc;
}
.pad .octave {
font-size: 0.75rem;
color: #888;
margin-top: 2px;
}
.pad.arp-highlight {
background: rgba(52, 211, 153, 0.3);
border-color: #34d399;
box-shadow: 0 0 25px rgba(52, 211, 153, 0.5);
}
.controls {
display: flex;
align-items: center;
gap: 20px;
flex-wrap: wrap;
justify-content: center;
}
.btn {
padding: 10px 24px;
border-radius: 8px;
border: none;
font-size: 1rem;
font-weight: 600;
cursor: pointer;
transition: all 0.2s;
}
.btn-play {
background: linear-gradient(135deg, #34d399, #059669);
color: #fff;
}
.btn-play:hover {
transform: scale(1.05);
box-shadow: 0 0 20px rgba(52, 211, 153, 0.4);
}
.btn-stop {
background: linear-gradient(135deg, #f87171, #dc2626);
color: #fff;
}
.btn-stop:hover {
transform: scale(1.05);
box-shadow: 0 0 20px rgba(248, 113, 113, 0.4);
}
.tempo-control {
display: flex;
align-items: center;
gap: 10px;
background: rgba(255,255,255,0.05);
padding: 8px 16px;
border-radius: 8px;
}
.tempo-control label {
font-size: 0.85rem;
color: #888;
}
.tempo-control input[type="range"] {
width: 120px;
accent-color: #a78bfa;
}
.tempo-control .bpm-val {
font-size: 1.1rem;
font-weight: 700;
color: #a78bfa;
min-width: 40px;
}
.wave-selector {
display: flex;
gap: 4px;
background: rgba(255,255,255,0.05);
padding: 4px;
border-radius: 8px;
}
.wave-btn {
padding: 6px 12px;
border: none;
border-radius: 6px;
background: transparent;
color: #888;
cursor: pointer;
font-size: 0.8rem;
transition: all 0.2s;
}
.wave-btn.active {
background: rgba(167, 139, 250, 0.3);
color: #a78bfa;
}
.wave-btn:hover {
color: #ccc;
}
.info {
margin-top: 16px;
font-size: 0.75rem;
color: #555;
}
</style>
</head>
<body>
<h1>🎵 Pentatonic Pad Grid</h1>
<p class="subtitle">Click pads to play · Toggle arpeggiator to sequence</p>
<div id="grid"></div>
<div class="controls">
<button class="btn btn-play" id="playBtn">▶ Play</button>
<div class="tempo-control">
<label>Tempo</label>
<input type="range" id="tempoSlider" min="40" max="240" value="120">
<span class="bpm-val" id="bpmVal">120</span>
</div>
<div class="wave-selector">
<button class="wave-btn active" data-wave="triangle">△</button>
<button class="wave-btn" data-wave="sine">∿</button>
<button class="wave-btn" data-wave="sawtooth">⩘</button>
<button class="wave-btn" data-wave="square">□</button>
</div>
</div>
<p class="info">All sound synthesized with Tone.js · No audio files</p>
<script src="tone.min.js"></script>
<script>
// ... Tone.js code
</script>
</body>
</html>
```
Now let me write the JavaScript part carefully.
Key considerations:
1. Audio context must be started on user interaction
2. The grid needs to be created dynamically
3. The arpeggiator sequence needs to be properly managed
4. Pad highlighting during arpeggio
5. Tempo changes need to update the sequence
Let me write the JS:
```javascript
// Pentatonic scale degrees
const PENTATONIC = ['C', 'D', 'E', 'G', 'A'];
const OCTAVES = [3, 4, 5, 6];
const NUM_ROWS = PENTATONIC.length; // 5
const NUM_COLS = OCTAVES.length; // 4
// State
let isPlaying = false;
let currentWave = 'triangle';
let synth, reverb, delay;
let sequence = null;
// Build grid
const gridEl = document.getElementById('grid');
const pads = [];
for (let row = 0; row < NUM_ROWS; row++) {
for (let col = 0; col < NUM_COLS; col++) {
const noteName = PENTATONIC[row] + OCTAVES[col];
const padIndex = row * NUM_COLS + col;
const pad = document.createElement('div');
pad.className = 'pad';
pad.dataset.index = padIndex;
pad.innerHTML = `
<span class="note">${PENTATONIC[row]}</span>
<span class="octave">${OCTAVES[col]}</span>
`;
pad.addEventListener('mousedown', () => playNote(padIndex));
pad.addEventListener('touchstart', (e) => { e.preventDefault(); playNote(padIndex); });
gridEl.appendChild(pad);
pads.push(pad);
}
}
// Audio setup
async function initAudio() {
await Tone.start();
reverb = new Tone.Reverb({ decay: 3, wet: 0.4 });
delay = new Tone.FeedbackDelay('8n.', 0.25);
reverb.toDestination();
delay.toDestination();
synth = new Tone.PolySynth(Tone.Synth, {
oscillator: { type: currentWave },
envelope: { attack: 0.01, decay: 0.3, sustain: 0.3, release: 0.8 }
});
synth.connect(reverb);
synth.connect(delay);
}
function playNote(padIndex) {
if (!synth) initAudio();
const row = Math.floor(padIndex / NUM_COLS);
const col = padIndex % NUM_COLS;
const noteName = PENTATONIC[row] + OCTAVES[col];
synth.triggerAttackRelease(noteName, '8n');
// Visual feedback
const pad = pads[padIndex];
pad.classList.add('active');
setTimeout(() => pad.classList.remove('active'), 200);
}
// Arpeggiator pattern
const ARP_PATTERN = [
0, 2, 4, 7, 9, 12, 14, 17, 19, 17, 14, 12, 9, 7, 4, 2,
5, 7, 9, 12, 14, 17, 19, 17, 14, 12, 9, 7, 5, 2, 0, 3,
1, 3, 5, 8, 10, 13, 15, 18, 0, 3, 5, 8, 10, 13, 15, 18
];
function startArpeggio() {
if (!synth) initAudio();
isPlaying = true;
updatePlayButton();
sequence = new Tone.Sequence((time, index) => {
const padIndex = ARP_PATTERN[index % ARP_PATTERN.length];
const row = Math.floor(padIndex / NUM_COLS);
const col = padIndex % NUM_COLS;
const noteName = PENTATONIC[row] + OCTAVES[col];
synth.triggerAttackRelease(noteName, '16n', time);
// Highlight pad
highlightPad(padIndex);
}, ARP_PATTERN.length, '8n').start(0);
Tone.getTransport().start();
}
function stopArpeggio() {
isPlaying = false;
updatePlayButton();
if (sequence) {
sequence.stop();
sequence.dispose();
sequence = null;
}
Tone.getTransport().stop();
// Clear all highlights
pads.forEach(p => p.classList.remove('arp-highlight'));
}
function highlightPad(padIndex) {
pads.forEach(p => p.classList.remove('arp-highlight'));
pads[padIndex].classList.add('arp-highlight');
}
function updatePlayButton() {
const btn = document.getElementById('playBtn');
if (isPlaying) {
btn.textContent = '⏹ Stop';
btn.className = 'btn btn-stop';
} else {
btn.textContent = '▶ Play';
btn.className = 'btn btn-play';
}
}
// Tempo control
const tempoSlider = document.getElementById('tempoSlider');
const bpmVal = document.getElementById('bpmVal');
tempoSlider.addEventListener('input', () => {
const bpm = parseInt(tempoSlider.value);
bpmVal.textContent = bpm;
Tone.getTransport().bpm.value = bpm;
if (sequence) {
sequence.interval = Tone.Time(bpm).toNotation();
// Actually, better to just update the transport BPM and the sequence interval
}
});
// Wave selector
document.querySelectorAll('.wave-btn').forEach(btn => {
btn.addEventListener('click', () => {
document.querySelectorAll('.wave-btn').forEach(b => b.classList.remove('active'));
btn.classList.add('active');
currentWave = btn.dataset.wave;
if (synth) {
synth.set({ oscillator: { type: currentWave } });
}
});
});
// Initialize transport
Tone.getTransport().bpm.value = 120;
```
Wait, I need to be more careful with the sequence. When using Tone.Sequence, the interval determines the step duration. If I use '8n' as the interval, each step is an eighth note at the current tempo.
When the tempo changes, I need to update the sequence's interval. Let me handle that properly.
Also, I need to handle the case where the user clicks a pad before initializing audio. Tone.start() needs to be called in a user gesture context.
Let me also think about the arpeggiator pattern more carefully. The pattern should sound musical and interesting. Let me create a pattern that:
1. Ascends through the pentatonic scale
2. Descends
3. Jumps around for variety
Actually, let me make the arpeggiator pattern simpler and more musical. I'll define it as a sequence of note indices that creates a nice flowing pattern.
Let me also think about the grid layout. 5 columns × 4 rows = 20 pads. Each column is a note (C, D, E, G, A), each row is an octave (3, 4, 5, 6).
Wait, I had it as rows = notes, cols = octaves. Let me think about which orientation looks better. I think rows = notes (pentatonic scale) and columns = octaves makes more visual sense - you can see the scale ascending vertically and octaves horizontally.
Actually, for a grid, it might be more intuitive to have rows = octaves (lower to higher) and columns = notes. That way, looking at the grid, you can see the pentatonic scale going left to right, and octaves going top to bottom.
Let me go with:
- Rows = octaves (C3/A3 top row, C6/A6 bottom row)
- Columns = pentatonic notes (C, D, E, G, A)
So the grid looks like:
```
C D E G A
C3 [C3] [D3] [E3] [G3] [A3]
C4 [C4] [D4] [E4] [G4] [A4]
C5 [C5] [D5] [E5] [G5] [A5]
C6 [C6] [D6] [E6] [G6] [A6]
```
This is more intuitive - each row is an octave, each column is a scale degree.
Index = octaveIndex * 5 + noteIndex
Let me recalculate:
- Pad 0: C3, Pad 1: D3, Pad 2: E3, Pad 3: G3, Pad 4: A3
- Pad 5: C4, Pad 6: D4, Pad 7: E4, Pad 8: G4, Pad 9: A4
- Pad 10: C5, Pad 11: D5, Pad 12: E5, Pad 13: G5, Pad 14: A5
- Pad 15: C6, Pad 16: D6, Pad 17: E6, Pad 18: G6, Pad 19: A6
Arpeggio pattern (using these indices):
A nice ascending/descending pattern:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
That's 40 steps, going up all 20 pads and back down. At 120 BPM with 8th notes, that's 20 seconds per cycle. That might be too slow.
Let me use shorter intervals. Maybe 16th notes: '16n'. At 120 BPM, 16th notes = 240 per minute = 4 per second. A 16-step pattern would take 4 seconds. That's better.
Let me create a more interesting pattern:
[0, 2, 4, 7, 9, 12, 14, 17, 19, 17, 14, 12, 9, 7, 4, 2] — 16 steps, skipping every other note for a wider interval feel.
Or I could make it step through by rows:
[0, 5, 10, 15, 16, 17, 18, 19, 14, 9, 4, 3, 2, 1, 0, 5, 10, 15, ...] — zigzag pattern
Let me go with a pattern that sounds good. I'll use:
[0, 1, 2, 3, 4, 9, 14, 19, 18, 17, 16, 15, 10, 5, 0, 5, 10, 15, 19, 14, 9, 4, 3, 2, 1, 0]
This creates a nice ascending/descending pattern with some octave jumps.
Actually, let me just keep it simple and musical. A classic pentatonic arpeggio pattern:
```javascript
const ARP_PATTERN = [
0, 1, 2, 3, 4, // C3 D3 E3 G3 A3 (ascending)
9, 14, 19, // A4 G5 A6 (higher octave)
18, 17, 16, 15, 10, // descending
5, 0, // back to C3
5, 6, 7, 8, 9, // C4 D4 E4 G4 A4
14, 19, // A5 A6
18, 13, 8, 3, // descending
0, 5, 10, 15, // C3 C4 C5 C6 (ascending by octave)
19, 14, 9, 4, 3, 2, 1, 0 // descending
];
```
That's 32 steps. At 16th notes and 120 BPM, that's 8 seconds per cycle. Good.
Let me finalize the code now. I also want to make sure the arpeggiator stops cleanly and the tempo slider works properly.
One issue: when changing tempo, I need to update the sequence's interval. With Tone.Sequence, I can set `sequence.interval` to a new value.
Actually, looking at Tone.js docs, Tone.Sequence takes an interval parameter. To change it dynamically, I can call `sequence.interval = Tone.Time(newBpm).toNotation()` or something similar. But actually, the simplest approach might be to stop and restart the sequence when tempo changes.
Or better yet, I can use `Tone.getTransport().bpm.rampTo(newBpm, 0.1)` for smooth tempo changes, and the sequence will follow.
Wait, actually Tone.Sequence uses the transport's tempo, so if I just update the transport BPM, the sequence timing will adjust automatically. The interval of the sequence is in musical time (like '16n'), not milliseconds, so it will scale with the tempo.
So I just need to update `Tone.getTransport().bpm.value` and the sequence will automatically adjust. That's much simpler!
Let me also handle the case where the user changes the waveform. I need to recreate the synth or update its oscillator type. With PolySynth, I can use `synth.set({ oscillator: { type: currentWave } })` but this might not work for all voices already playing. A cleaner approach might be to dispose and recreate the synth, but that could cause clicks.
Actually, `synth.set()` should work for changing the oscillator type for future notes. Let me test this approach.
Hmm, actually with PolySynth, `set()` might not propagate to individual voice synths properly. Let me use a different approach: store the synth voices and update them, or just recreate the synth when the waveform changes.
For simplicity, let me just recreate the synth when the waveform changes. The reverb and delay stay the same.
Actually, let me look at this more carefully. PolySynth has a `set` method that should work:
```javascript
synth.set({
oscillator: { type: 'sine' },
envelope: { attack: 0.01, decay: 0.3, sustain: 0.3, release: 0.8 }
});
```
This should update the default settings for new voices. Existing voices might not change until they're re-triggered. That should be fine for our use case.
OK, let me write the final complete code now. I'll be thorough and make sure everything works.
One more thing: I should make sure the grid looks good on different screen sizes. I'll use responsive sizing.
Let me also add some visual flair:
- Glow effects on pads when they're active
- Smooth transitions
- The arpeggiator highlight should have a smooth pulse animation
Let me finalize and write the code.
Actually, I realize I should also handle the case where the user hasn't interacted with the page yet (audio context not started). I'll initialize audio on the first user interaction.
Here's my final plan for the JavaScript:
1. Build the grid dynamically
2. Set up audio on first interaction
3. Handle pad clicks to play notes
4. Handle play/stop for arpeggiator
5. Handle tempo changes
6. Handle waveform changes
7. Visual feedback for active pads and arpeggiator highlights
Let me write the complete file now.
I also want to add a nice touch: when the arpeggiator is running, the pads should have a subtle animation. And the play button should have a nice pulse animation when the arpeggiator is active.
Let me also add a volume control slider.
OK, let me write the complete code now. I'll be comprehensive but not over-engineered.
One more consideration: the Tone.Sequence callback. The callback receives (time, noteIndex) where time is the precise audio time and noteIndex is the current step index. I should use the time parameter for scheduling notes to avoid timing issues.
Let me also think about whether to use Tone.Sequence or Tone.Part. Tone.Sequence is better for looping patterns with a fixed interval. Tone.Part is better for precise timing. For an arpeggiator, Tone.Sequence is the right choice.
Here's my final code:
Actually wait - I want to double-check the Tone.Sequence API. In Tone.js 14+, the API might be slightly different. Let me use the standard approach:
```javascript
const sequence = new Tone.Sequence((time, step) => {
// step is the index of the current step
const padIndex = ARP_PATTERN[step % ARP_PATTERN.length];
// play note...
}, ARP_PATTERN.length, '16n').start(0);
```
Wait, actually the Tone.Sequence constructor takes (callback, pattern, interval). The pattern can be an array of values, and the callback receives (time, value) where value is the current element from the pattern array.
So I could do:
```javascript
const sequence = new Tone.Sequence((time, noteIndex) => {
// noteIndex is directly from ARP_PATTERN
const row = Math.floor(noteIndex / NUM_COLS);
const col = noteIndex % NUM_COLS;
const noteName = PENTATONIC[row] + OCTAVES[col];
synth.triggerAttackRelease(noteName, '16n', time);
highlightPad(noteIndex);
}, ARP_PATTERN, '16n').start(0);
```
This is cleaner - the pattern array contains the actual pad indices, and the callback receives each one directly.
OK, I think I have everything figured out. Let me write the final code.
One more thing: I should make sure the grid is responsive. On mobile, the pads should be smaller. I'll use CSS grid with `auto-fit` or just set a max-width and use `fr` units.
Let me also add a nice header with the app title and a brief description.
Alright, writing the final code now. I'll make it comprehensive and polished.
Let me reconsider the layout. The grid should be square-ish and centered. With 5 columns and 4 rows, each pad should be roughly equal size.
For the grid container, I'll use CSS Grid with `grid-template-columns: repeat(5, 1fr)` and let the rows be auto-sized.
Let me also add keyboard support - maybe map keys to the pads? That could be a nice touch but might be overcomplicating things. Let me skip it for now.
Final code coming up:
I need to be careful about one thing: when the user clicks a pad while the arpeggiator is running, the arpeggiator highlight should not interfere with the manual pad highlight. I'll make the manual highlight use a different class or override the arpeggiator highlight.
Let me also add a subtle background animation or gradient to make the page feel more alive.
OK, writing the final code now. This is going to be a substantial file.
Let me also think about error handling. What if Tone.js fails to load? What if the user's browser doesn't support Web Audio? I'll add a basic check.
Actually, since tone.min.js is provided and we're told to use it, I'll assume it works. But I should still handle the case where the user hasn't started the audio context yet.
Here's my approach for audio initialization:
- All audio setup happens in an async function called `initAudio()`
- This function is called on the first user interaction (pad click or play button)
- It uses `await Tone.start()` to resume the audio context
- After initialization, subsequent calls to `initAudio()` are no-ops
Let me write the code now.
Actually, I realize I should also think about the reverb and delay routing more carefully. I want the synth to go through both reverb and delay, but I need to be careful about routing:
```
synth → reverb → destination
synth → delay → destination
```
This way, the dry signal goes through both effects in parallel. That should sound good.
But wait, if I connect synth to both reverb and delay, and both are connected to destination, there might be gain issues. Let me use a mixer or just keep it simple:
```
synth → reverb → destination
synth → delay → destination
```
This should be fine. The reverb and delay will each get a copy of the dry signal, and their wet signals go to destination.
Actually, I should also consider that the delay feedback could cause issues if it's too high. I'll keep the feedback low (0.25) and the delay time short ('8n.').
Let me also add a wet/dry mix control for the reverb, but that might be overkill. Let me keep it simple.
OK, final code:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pentatonic Pad Grid</title>
<style>
/* ... all styles ... */
</style>
</head>
<body>
<!-- ... HTML structure ... -->
<script src="tone.min.js"></script>
<script>
// ... all JS ...
</script>
</body>
</html>
```
Let me write it all out now. I'll be thorough and make sure everything is correct.
One more thought on the arpeggiator pattern: I want it to sound good and musical. Let me define a few patterns and let the user cycle through them, or just pick one good one.
I'll go with a single well-crafted pattern that sounds good. Here it is:
```javascript
const ARP_PATTERN = [
0, 2, 4, 7, 9, // C3 E3 A3 G4 A4 (ascending)
14, 19, 17, 14, // A5 G5 A5 (high)
12, 9, 7, 4, 2, // E5 A4 G4 E3 D3 (descending)
0, 5, 10, 15, // C3 C4 C5 C6 (ascending octaves)
19, 14, 9, 4, // A6 A5 A4 A3 (descending)
18, 13, 8, 3, // G6 G5 G4 G3 (descending)
17, 12, 7, 2, // E6 E5 E4 E3 (descending)
16, 11, 6, 1, // D6 D5 D4 D3 (descending)
15, 10, 5, 0, // C6 C5 C4 C3 (descending)
4, 9, 14, 19, // A3 A4 A5 A6 (ascending)
18, 13, 8, 3, 0 // G6 G5 G4 G3 C3 (descending to root)
];
```
That's 44 steps. At 16th notes and 120 BPM, that's about 8.8 seconds per cycle. Good.
Actually, let me simplify the pattern a bit. I don't want it to be too long or complex. Let me use a 32-step pattern:
```javascript
const ARP_PATTERN = [
0, 2, 4, 7, 9, 12, 14, 17, 19, // ascending
19, 17, 14, 12, 9, 7, 4, 2, 0, // descending
5, 7, 9, 12, 14, 17, 19, 17, 14, 12, 9, 7, 5, // higher octave
10, 12, 14, 17, 19, 17, 14, 12, 10, // highest octave
15, 17, 19, 17, 15, 10, 5, 0 // descend back to root
];
```
That's 38 steps. Let me trim to 32:
```javascript
const ARP_PATTERN = [
0, 2, 4, 7, 9, 12, 14, 17, 19,
19, 17, 14, 12, 9, 7, 4, 2, 0,
5, 7, 9, 12, 14, 17, 19, 14, 9, 5,
10, 12, 14, 17, 19, 14, 10, 5,
15, 17, 19, 15, 10, 5, 0
];
```
That's 46 steps. Let me just go with something reasonable and stop overthinking:
```javascript
const ARP_PATTERN = [
0, 1, 2, 3, 4, 9, 14, 19,
18, 17, 16, 15, 10, 5, 0,
5, 6, 7, 8, 9, 14, 19, 14,
13, 12, 11, 10, 5, 0, 3,
8, 13, 18, 13, 8, 3, 0
];
```
38 steps. This creates a nice pattern that goes up through the scale, drops to the next octave, comes back down, then starts again higher. It should sound musical and interesting.
OK, I'm going to write the final code now. No more deliberation.
Let me also think about what happens when the user clicks a pad while the arpeggiator is running. The pad should play the note and show a visual flash, but the arpeggiator should continue running unaffected.
I also want to add a subtle visual effect: when a pad is triggered (either by click or by arpeggiator), it should briefly glow brighter and then fade back.
For the arpeggiator highlight, I'll use a green glow to distinguish it from the manual click highlight (which uses a purple glow).
Let me write the final code now.
Actually, I want to reconsider the grid orientation one more time. I think having the notes as columns and octaves as rows makes the most sense visually:
```
C D E G A
C3 [C3] [D3] [E3] [G3] [A3]
C4 [C4] [D4] [E4] [G4] [A4]
C5 [C5] [D5] [E5] [G5] [A5]
C6 [C6] [D6] [E6] [G6] [A6]
```
This way, each column is a pentatonic note and each row is an octave. It's easy to read and understand.
The index calculation: padIndex = octaveIndex * 5 + noteIndex
Where noteIndex: C=0, D=1, E=2, G=3, A=4
And octaveIndex: 3=0, 4=1, 5=2, 6=3
So:
- C3 = 0*5+0 = 0
- D3 = 0*5+1 = 1
- E3 = 0*5+2 = 2
- G3 = 0*5+3 = 3
- A3 = 0*5+4 = 4
- C4 = 1*5+0 = 5
- D4 = 1*5+1 = 6
- E4 = 1*5+2 = 7
- G4 = 1*5+3 = 8
- A4 = 1*5+4 = 9
- C5 = 2*5+0 = 10
- D5 = 2*5+1 = 11
- E5 = 2*5+2 = 12
- G5 = 2*5+3 = 13
- A5 = 2*5+4 = 14
- C6 = 3*5+0 = 15
- D6 = 3*5+1 = 16
- E6 = 3*5+2 = 17
- G6 = 3*5+3 = 18
- A6 = 3*5+4 = 19
This gives us 20 pads total (5 notes × 4 octaves).
OK, writing the final code now for real.
Let me also think about the overall page layout:
- Title at top
- Grid in the center
- Controls below the grid (play/stop, tempo, waveform)
- Subtle footer text
The page should feel like a music production tool - dark, sleek, modern.
Color scheme:
- Background: very dark blue-gray (#0a0a12)
- Pads: dark with subtle border, glow on active
- Accent: purple (#a78bfa) for active pads, green (#34d399) for arpeggiator
- Text: light gray (#e0e0e0)
Let me write it all now.
I want to make sure the code is clean and well-commented. Let me structure it:
1. Constants (pentatonic notes, octaves, arpeggio pattern)
2. State variables
3. DOM references
4. Grid building function
5. Audio initialization
6. Note playing function
7. Arpeggiator functions (start/stop)
8. Visual feedback functions
9. Event listeners (play/stop, tempo, waveform)
10. Initialization
Let me write the complete file now.
One more thing: I should handle the case where the user resizes the window or the page is loaded on a small screen. The grid should be responsive. I'll use CSS grid with `minmax` and `auto-fit` or just set a max-width.
Actually, for a grid of fixed 5 columns, I'll just set the grid container to a max-width and use `1fr` for each column. The pads will scale with the container.
OK, final code:
I realize I should also handle the case where Tone.js might not be loaded yet when the script runs. Since the script tag for tone.min.js is before our script, it should be loaded by the time our script runs. But I should still check `if (typeof Tone !== 'undefined')`.
Let me also add a loading state or message in case Tone.js fails to load.
Alright, I'm writing the final code now. Here goes:
Let me think about one more thing: the arpeggiator sequence timing. I want the arpeggiator to play 16th notes at the current tempo. So the interval should be '16n'. At 120 BPM, 16th notes = 4 per second = 250ms each. That sounds good for an arpeggiator.
But I should make the note duration shorter than the step interval so there's space between notes. I'll use '16n' for the note duration as well, which means each note will be 1/16th note long and the next note starts immediately after. This creates a smooth, flowing arpeggio.
Actually, if I use '16n' for both the interval and the note duration, the notes will just touch each other with no gap. That might sound too staccato. Let me use '16n' for the interval but '32n' for the note duration, so there's a tiny gap between notes. Or I could use '16n' for both and let the release tail of the synth create the space.
Hmm, actually for a pentatonic pad with reverb, using '16n' for both interval and duration should work fine because the reverb tail will fill in the gaps. Let me go with that.
Wait, but if I use '16n' for the note duration and the arpeggiator is playing 16th notes, each note will be cut off when the next one starts. That's fine for an arpeggiator - it creates a staccato, rhythmic feel.
Actually, let me use a slightly longer note duration. '8n' (eighth note) duration with '16n' interval would mean notes overlap, creating a legato feel. That might sound better with reverb.
Let me use '8n' for note duration and '16n' for the sequence interval. This way, each note sustains for 2 steps, creating a legato arpeggio effect.
Hmm, but that could get muddy with reverb. Let me just use '16n' for both and let the reverb create the ambience. The staccato feel is actually more typical for arpeggiators.
OK, final decision: '16n' interval, '16n' note duration. The reverb will add the sustain.
Now, truly writing the final code:
Let me also think about the play/stop button behavior. When the user clicks "Play", the arpeggiator starts. When they click "Stop", it stops. The button text and style should change accordingly.
I also want to add a visual indicator that the arpeggiator is running - maybe a pulsing animation on the play button or a status indicator.
Let me also add a "clear" or "reset" feature - when the arpeggiator stops, all pad highlights should be cleared.
OK, I think I've thought about this enough. Let me write the code.
One last thing: I want to make sure the grid pads have proper aspect ratios and look good. I'll use `aspect-ratio: 1` on the pads and make them square.
Here's the complete code:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pentatonic Pad Grid</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
background: #0a0a12;
color: #e0e0e0;
font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
min-height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
padding: 24px 16px;
overflow-x: hidden;
}
h1 {
font-size: clamp(1.4rem, 4vw, 2rem);
margin-bottom: 4px;
background: linear-gradient(135deg, #a78bfa 0%, #60a5fa 50%, #34d399 100%);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
letter-spacing: -0.02em;
}
.subtitle {
color: #555;
font-size: 0.85rem;
margin-bottom: 20px;
}
#grid {
display: grid;
grid-template-columns: repeat(5, 1fr);
gap: 6px;
max-width: 560px;
width: 100%;
margin-bottom: 20px;
}
.pad {
aspect-ratio: 1;
border-radius: 10px;
border: 2px solid rgba(255,255,255,0.06);
background: rgba(255,255,255,0.02);
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
cursor: pointer;
transition: all 0.12s ease;
user-select: none;
-webkit-user-select: none;
position: relative;
overflow: hidden;
}
.pad::before {
content: '';
position: absolute;
inset: 0;
border-radius: 8px;
opacity: 0;
transition: opacity 0.12s ease;
}
.pad:hover {
background: rgba(255,255,255,0.06);
border-color: rgba(255,255,255,0.12);
transform: scale(1.03);
}
.pad:active {
transform: scale(0.97);
}
.pad.click-active {
background: rgba(167, 139, 250, 0.25);
border-color: rgba(167, 139, 250, 0.6);
box-shadow: 0 0 16px rgba(167, 139, 250, 0.35), inset 0 0 12px rgba(167, 139, 250, 0.1);
}
.pad.arp-active {
background: rgba(52, 211, 153, 0.25);
border-color: rgba(52, 211, 153, 0.6);
box-shadow: 0 0 16px rgba(52, 211, 153, 0.35), inset 0 0 12px rgba(52, 211, 153, 0.1);
}
.pad .note-label {
font-size: clamp(0.8rem, 2vw, 1.05rem);
font-weight: 700;
color: #bbb;
line-height: 1;
}
.pad .octave-label {
font-size: clamp(0.6rem, 1.5vw, 0.75rem);
color: #666;
margin-top: 2px;
}
.controls {
display: flex;
align-items: center;
gap: 16px;
flex-wrap: wrap;
justify-content: center;
}
.btn {
padding: 10px 28px;
border-radius: 8px;
border: none;
font-size: 1rem;
font-weight: 600;
cursor: pointer;
transition: all 0.2s ease;
letter-spacing: 0.02em;
}
.btn-play {
background: linear-gradient(135deg, #34d399, #059669);
color: #fff;
}
.btn-play:hover {
transform: translateY(-1px);
box-shadow: 0 4px 20px rgba(52, 211, 153, 0.35);
}
.btn-play.playing {
background: linear-gradient(135deg, #f87171, #dc2626);
animation: pulse 1.5s ease-in-out infinite;
}
.btn-stop {
background: linear-gradient(135deg, #f87171, #dc2626);
color: #fff;
}
.btn-stop:hover {
transform: translateY(-1px);
box-shadow: 0 4px 20px rgba(248, 113, 113, 0.35);
}
@keyframes pulse {
0%, 100% { box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.4); }
50% { box-shadow: 0 0 0 8px rgba(248, 113, 113, 0); }
}
.tempo-control {
display: flex;
align-items: center;
gap: 8px;
background: rgba(255,255,255,0.04);
padding: 8px 14px;
border-radius: 8px;
border: 1px solid rgba(255,255,255,0.06);
}
.tempo-control label {
font-size: 0.8rem;
color: #777;
white-space: nowrap;
}
.tempo-control input[type="range"] {
width: 100px;
accent-color: #a78bfa;
cursor: pointer;
}
.tempo-control .bpm-val {
font-size: 1rem;
font-weight: 700;
color: #a78bfa;
min-width: 36px;
text-align: center;
}
.wave-selector {
display: flex;
gap: 3px;
background: rgba(255,255,255,0.04);
padding: 3px;
border-radius: 8px;
border: 1px solid rgba(255,255,255,0.06);
}
.wave-btn {
padding: 6px 10px;
border: none;
border-radius: 6px;
background: transparent;
color: #666;
cursor: pointer;
font-size: 0.85rem;
transition: all 0.2s;
}
.wave-btn.active {
background: rgba(167, 139, 250, 0.2);
color: #a78bfa;
}
.wave-btn:hover {
color: #aaa;
}
.status {
margin-top: 14px;
font-size: 0.75rem;
color: #444;
text-align: center;
}
.status .dot {
display: inline-block;
width: 6px;
height: 6px;
border-radius: 50%;
background: #34d399;
margin-right: 4px;
vertical-align: middle;
opacity: 0;
transition: opacity 0.3s;
}
.status .dot.on {
opacity: 1;
animation: blink 1s ease-in-out infinite;
}
@keyframes blink {
0%, 100% { opacity: 1; }
50% { opacity: 0.3; }
}
</style>
</head>
<body>
<h1>✦ Pentatonic Pad Grid</h1>
<p class="subtitle">Click pads to play · Toggle arpeggiator to sequence</p>
<div id="grid"></div>
<div class="controls">
<button class="btn btn-play" id="playBtn">▶ Play</button>
<div class="tempo-control">
<label>Tempo</label>
<input type="range" id="tempoSlider" min="40" max="240" value="120">
<span class="bpm-val" id="bpmVal">120</span>
</div>
<div class="wave-selector">
<button class="wave-btn active" data-wave="triangle">△</button>
<button class="wave-btn" data-wave="sine">∿</button>
<button class="wave-btn" data-wave="sawtooth">⩘</button>
<button class="wave-btn" data-wave="square">□</button>
</div>
</div>
<p class="status">
<span class="dot" id="statusDot"></span>
<span id="statusText">Ready</span>
</p>
<script src="tone.min.js"></script>
<script>
// ── Constants ──
const PENTATONIC = ['C', 'D', 'E', 'G', 'A'];
const OCTAVES = [3, 4, 5, 6];
const NUM_NOTES = PENTATONIC.length; // 5
const NUM_OCTAVES = OCTAVES.length; // 4
const TOTAL_PADS = NUM_NOTES * NUM_OCTAVES; // 20
// Arpeggiator pattern: indices into the 20 pads
const ARP_PATTERN = [
0, 1, 2, 3, 4, 9, 14, 19,
18, 17, 16, 15, 10, 5, 0, 5,
6, 7, 8, 9, 14, 19, 14, 13,
12, 11, 10, 5, 0, 3, 8, 13,
18, 13, 8, 3, 0, 15, 16, 17,
18, 19, 14, 9, 4, 3, 2, 1,
0
];
// ── State ──
let isPlaying = false;
let currentWave = 'triangle';
let synth = null;
let reverb = null;
let delay = null;
let sequence = null;
let audioInitialized = false;
// ── DOM ──
const gridEl = document.getElementById('grid');
const playBtn = document.getElementById('playBtn');
const tempoSlider = document.getElementById('tempoSlider');
const bpmVal = document.getElementById('bpmVal');
const statusDot = document.getElementById('statusDot');
const statusText = document.getElementById('statusText');
const pads = [];
// ── Build Grid ──
for (let octIdx = 0; octIdx < NUM_OCTAVES; octIdx++) {
for (let noteIdx = 0; noteIdx < NUM_NOTES; noteIdx++) {
const padIndex = octIdx * NUM_NOTES + noteIdx;
const noteName = PENTATONIC[noteIdx];
const octave = OCTAVES[octIdx];
const pad = document.createElement('div');
pad.className = 'pad';
pad.dataset.index = padIndex;
pad.innerHTML = `
<span class="note-label">${noteName}</span>
<span class="octave-label">${octave}</span>
`;
pad.addEventListener('mousedown', (e) => {
e.preventDefault();
playNote(padIndex);
});
pad.addEventListener('touchstart', (e) => {
e.preventDefault();
playNote(padIndex);
}, { passive: false });
gridEl.appendChild(pad);
pads.push(pad);
}
}
// ── Audio Init ──
async function initAudio() {
if (audioInitialized) return;
await Tone.start();
reverb = new Tone.Reverb({ decay: 3.5, wet: 0.35 });
delay = new Tone.FeedbackDelay('8n.', 0.2);
reverb.toDestination();
delay.toDestination();
synth = new Tone.PolySynth(Tone.Synth, {
oscillator: { type: currentWave },
envelope: { attack: 0.01, decay: 0.25, sustain: 0.35, release: 0.6 }
});
synth.connect(reverb);
synth.connect(delay);
audioInitialized = true;
statusText.textContent = 'Audio ready';
}
// ── Play Note ──
function playNote(padIndex) {
if (!audioInitialized) initAudio();
const octIdx = Math.floor(padIndex / NUM_NOTES);
const noteIdx = padIndex % NUM_NOTES;
const noteName = PENTATONIC[noteIdx] + OCTAVES[octIdx];
synth.triggerAttackRelease(noteName, '16n');
// Visual feedback
const pad = pads[padIndex];
pad.classList.add('click-active');
setTimeout(() => pad.classList.remove('click-active'), 250);
}
// ── Arpeggiator ──
function startArpeggio() {
if (!audioInitialized) initAudio();
isPlaying = true;
updatePlayButton();
statusDot.classList.add('on');
statusText.textContent = 'Arpeggiator running';
sequence = new Tone.Sequence((time, noteIndex) => {
const octIdx = Math.floor(noteIndex / NUM_NOTES);
const noteIdx = noteIndex % NUM_NOTES;
const noteName = PENTATONIC[noteIdx] + OCTAVES[octIdx];
synth.triggerAttackRelease(noteName, '16n', time);
highlightPad(noteIndex);
}, ARP_PATTERN, '16n').start(0);
Tone.getTransport().start();
}
function stopArpeggio() {
isPlaying = false;
updatePlayButton();
statusDot.classList.remove('on');
statusText.textContent = 'Stopped';
if (sequence) {
sequence.stop();
sequence.dispose();
sequence = null;
}
Tone.getTransport().stop();
// Clear all highlights
pads.forEach(p => p.classList.remove('arp-active'));
}
function highlightPad(padIndex) {
pads.forEach(p => p.classList.remove('arp-active'));
pads[padIndex].classList.add('arp-active');
}
function updatePlayButton() {
if (isPlaying) {
playBtn.textContent = '⏹ Stop';
playBtn.className = 'btn btn-stop playing';
} else {
playBtn.textContent = '▶ Play';
playBtn.className = 'btn btn-play';
}
}
// ── Tempo ──
tempoSlider.addEventListener('input', () => {
const bpm = parseInt(tempoSlider.value);
bpmVal.textContent = bpm;
Tone.getTransport().bpm.value = bpm;
});
// ── Waveform ──
document.querySelectorAll('.wave-btn').forEach(btn => {
btn.addEventListener('click', () => {
document.querySelectorAll('.wave-btn').forEach(b => b.classList.remove('active'));
btn.classList.add('active');
currentWave = btn.dataset.wave;
if (synth) {
synth.set({ oscillator: { type: currentWave } });
}
});
});
// ── Play/Stop Button ──
playBtn.addEventListener('click', async () => {
if (!audioInitialized) await initAudio();
if (isPlaying) {
stopArpeggio();
} else {
startArpeggio();
}
});
// ── Init Transport ──
Tone.getTransport().bpm.value = 120;
</script>
</body>
</html>
```
Wait, I need to double-check a few things:
1. The Tone.Sequence constructor - does it accept an array as the second argument? Let me check... Yes, in Tone.js 14+, Tone.Sequence takes (callback, pattern, interval) where pattern is an array of values. The callback receives (time, value) where value is the current element from the pattern array.
2. The `synth.set()` method - does PolySynth have a `set` method? Yes, it inherits from Tone.PolySynth which inherits from Tone.Synth which has `set()`.
3. The `Tone.Time(bpm).toNotation()` - I'm not using this anymore since I just update the transport BPM directly.
4. The `sequence.interval` - I'm not modifying this either since the sequence uses musical time ('16n') which scales with the transport BPM.
5. The `Tone.getTransport().stop()` - this stops the transport but doesn't clear scheduled events. The sequence.stop() should handle that.
6. I should make sure that when the arpeggiator stops, the transport is also stopped. Otherwise, the transport keeps running in the background.
Actually, I realize there's a subtlety: when I call `Tone.getTransport().stop()`, it stops the transport, but if I later call `Tone.getTransport().start()` again, it starts from the beginning of the transport timeline, not from where it was stopped. This should be fine for our use case.
But wait, when I stop the sequence and then restart it, the sequence starts from step 0 again. That's the desired behavior.
Let me also think about edge cases:
- What if the user clicks the play button multiple times rapidly? I should prevent double-starting.
- What if the user changes tempo while the arpeggiator is running? The transport BPM update should handle this automatically.
I think the code handles these cases correctly. Let me finalize it.
One more thing: I want to make sure the grid looks good on mobile. The pads should be large enough to tap. With 5 columns and 4 rows, on a 320px wide screen, each pad would be about 56px wide (with 6px gaps). That's a reasonable touch target.
Actually, let me increase the gap slightly and make the pads a bit bigger on mobile. I'll use `clamp()` for the font sizes and make sure the grid has some padding.
I think the code is ready. Let me write it to the file.
Hmm, actually I realize I should also add a small visual indicator showing which note is currently being played by the arpeggiator. The green highlight on the pad should be sufficient for this.
Let me also add a subtle background gradient or noise to make the page feel more alive. I'll add a very subtle radial gradient behind the grid.
OK, I'm satisfied with the design. Let me write the final file.
Wait, one more consideration: the `Tone.Sequence` constructor in Tone.js v14+ might have a different API. Let me check...
In Tone.js 14.x:
```javascript
new Tone.Sequence(callback, pattern, interval)
```
Where:
- `callback` is called with `(time, value)` for each step
- `pattern` is an array of values
- `interval` is the time between steps (e.g., '16n')
The `start(time)` method starts the sequence at the given time.
This should work correctly.
One thing I want to double-check: does `Tone.PolySynth.set()` properly update the oscillator type for all voices? Let me think...
`Tone.PolySynth` extends `Tone.Synth`. The `set()` method on `Tone.Synth` sets properties on the synth's options. For `Tone.PolySynth`, the `set()` method should propagate to the voice synth. But I'm not 100% sure about this.
A safer approach would be to recreate the synth when the waveform changes:
```javascript
function setWaveform(wave) {
currentWave = wave;
if (synth) {
synth.dispose();
synth = new Tone.PolySynth(Tone.Synth, {
oscillator: { type: currentWave },
envelope: { attack: 0.01, decay: 0.25, sustain: 0.35, release: 0.6 }
});
synth.connect(reverb);
synth.connect(delay);
}
}
```
But disposing and recreating the synth might cause a brief gap in audio. For our use case, it should be fine since the user is just changing the waveform, not in the middle of a performance.
Actually, let me test the `synth.set()` approach first since it's simpler. If it doesn't work, I can switch to recreating.
Looking at the Tone.js source code, `PolySynth.set()` calls `this.set()` which is inherited from `Tone`. The `Tone.set()` method sets properties on the object. For `PolySynth`, this would set the `oscillator` property, which is then used when creating new voices. Existing voices would continue with their current oscillator type until they're released and new ones are created.
So `synth.set({ oscillator: { type: 'sine' } })` would change the oscillator type for new notes, but existing notes would continue with the old type. This is actually fine for our use case.
OK, I'm going with the `synth.set()` approach.
Let me finalize the code and write it to the file.
Actually, I just realized I should also handle the case where the user clicks a pad while the arpeggiator is running. The arpeggiator highlight might be on a different pad, and the click highlight (purple) should override it temporarily. After the click highlight fades, the arpeggiator highlight (if any) should return.
My current code handles this because:
1. Click adds 'click-active' class (purple glow)
2. After 250ms, 'click-active' is removed
3. The arpeggiator 'arp-active' class (green glow) remains on whatever pad it's on
If the user clicks the same pad that the arpeggiator is highlighting, both classes would be on the pad, and the 'click-active' style would take precedence (since it's added after and CSS specificity would make it override).
Wait, actually both classes are on the same element, and the CSS rules have the same specificity. The one that comes later in the stylesheet would win. Let me check my CSS...
'.pad.click-active' and '.pad.arp-active' have the same specificity. The one that comes later wins. In my CSS, '.arp-active' comes after '.click-active', so arp-active would win. That's not ideal - I want the click highlight to override the arp highlight.
Let me fix this by making '.click-active' come after '.arp-active' in the CSS, or by increasing its specificity.
Actually, the simplest fix is to make '.click-active' override '.arp-active' by placing it later in the CSS. Let me reorder:
```css
.pad.arp-active { ... }
.pad.click-active { ... }
```
This way, when both classes are present, '.click-active' wins.
But wait, there's another issue: when the arpeggiator moves to a different pad, it removes 'arp-active' from all pads and adds it to the new one. If the user clicked a pad and 'click-active' is still on it, and the arpeggiator moves away, the 'click-active' would remain until its timeout fires. That's actually fine - it's a nice visual effect showing which pad the user just clicked.
OK, I think the code is good. Let me write it to the file now.
One final thought: I should add `prefers-reduced-motion` support for accessibility. But that might be overkill for this project. Let me skip it.
Let me write the final file now.→ bash
{"command":"cat /tmp/ws/tone.min.js | head -c 200"}toolResult
/*! For license information please see Tone.js.LICENSE.txt */ !function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"ob
assistant
thinking
Good, tone.min.js is present and valid. Now let me write the complete index.html file. I have all the design decisions made. Let me write it out.
Now I'll build the complete single-file
→ write
/tmp/ws/index.html (10678 bytes)toolResult
Successfully wrote 10678 bytes to /tmp/ws/index.html
assistant
thinking
The file has been written. Let me verify it exists and check its contents briefly to make sure everything is correct.
Let me verify the file is complete and well
→ bash
{"command":"wc -l /tmp/ws/index.html && echo \"---\" && tail -5 /tmp/ws/index.html && echo \"---\" && head -3 /tmp/ws/index.html"}toolResult
298 /tmp/ws/index.html --- /* ── Init transport BPM ── */ Tone.getTransport().bpm.value = 120; </script> </body> </html> --- <!DOCTYPE html> <html lang="en"> <head>
assistant
thinking
The file looks complete. Let me verify it's valid HTML and that all the key components are present: 1. ✅ DOCTYPE and html structure 2. ✅ tone.min.js loaded via script tag 3. ✅ CSS in <style> tag 4. ✅ JS in <script> tag 5. ✅ Pentatonic pad grid (5 notes × 4 octaves = 20 pads) 6. ✅ Synth with reverb and delay 7. ✅ Play/stop button for arpeggiator 8. ✅ Adjustable tempo slider 9. ✅ Waveform selector 10. ✅ No external resources, no audio files The file looks good. Let me also verify there are no syntax issues by checking the JS structure briefly.
The file is complete at 298 lines. Let me do a quick sanity check on the JavaScript structure:
→ bash
{"command":"cd /tmp/ws && node -e \"\nconst fs = require('fs');\nconst html = fs.readFileSync('index.html','utf8');\n// Extract JS between stoolResult
Has Tone.start: true Has PolySynth: true Has Reverb: true Has FeedbackDelay: true Has Sequence: true Has ARP_PATTERN: true Has tempo slider: true Has waveform selector: true Has play/stop: true Has triggerAttackRelease: true Has connect(reverb): true Has connect(delay): true No CDN/external: true No audio files: false All checks passed!
assistant
thinking
The "No audio files" check returned false, but that's because the word "wav" or "mp3" might appear somewhere in the code - let me check. Actually, looking at the check more carefully, it says "No audio files: false" which means it found .mp3, .wav, or .ogg somewhere. Let me check what it found. Wait, looking at the code, I don't see any audio file references. Let me check more carefully. The check is looking for `.mp3`, `.wav`, `.ogg` in the JS code. Let me search for these. Actually, it might be a false positive from the word "wav" appearing in a comment or something. Let me check. Actually, looking at my code, I don't have any of those strings. The check might be matching something in the HTML or CSS. Let me verify. Hmm, but the check says "No audio files: false" - this could be a false positive. Let me search more carefully. Actually wait - the regex extracts only the JS part after `tone.min.js` script tag. So it's only checking the JS. Let me look at my JS code again... I don't see any .mp3, .wav, or .ogg references. Let me just grep for it to be sure.
Let me check that false positive on audio files:
→ bash
{"command":"grep -n '\\.mp3\\|\\.wav\\|\\.ogg' /tmp/ws/index.html"}toolResult
90: .wave-selector{display:flex;gap:3px;background:rgba(255,255,255,0.04);padding:3px;border-radius:8px;border:1px solid rgba(255,255,255,0.06)} 91: .wave-btn{padding:6px 10px;border:none;border-radius:6px;background:transparent;color:#666;cursor:pointer;font-size:0.85rem;transition:all .2s} 92: .wave-btn.active{background:rgba(167,139,250,0.2);color:#a78bfa} 93: .wave-btn:hover{color:#aaa} 277: document.querySelectorAll('.wave-btn').forEach(btn => { 279: document.querySelectorAll('.wave-btn').forEach(b => b.classList.remove('active')); 281: currentWave = btn.dataset.wave;
assistant
thinking
The grep found "wav" in CSS class names like `.wave-selector`, `.wave-btn`, and in JS selectors like `.wave-btn`. These are CSS class names for the waveform selector buttons, not actual audio files. The "No audio files" check was a false positive due to the word "wav" appearing in class names. There are no actual audio file references in the code. The app is complete and correct. Let me summarize what was built.
The "wav" matches are just CSS class names (`.wave-btn`, `.wave-selector`) for the waveform selector — not actual audio files. No audio files are referenced anywhere. The app is complete at `/tmp/ws/index.html` with all features: - **20-pad pentatonic grid** (5 notes × 4 octaves: C3–A6) — click any pad to trigger a note - **Synth voice with reverb + delay** — `PolySynth` → `Reverb` + `FeedbackDelay` → destination, all synthesized - **Arpeggiator** — `Tone.Sequence` loops through a 48-step pentatonic pattern at 16th-note intervals; active pad glows green - **Play/Stop toggle** — button switches between ▶ Play and ⏹ Stop with a pulsing animation when running - **Tempo slider** (40–240 BPM) — updates `Tone.getTransport().bpm` in real time; the sequence follows automatically since it uses musical time (`'16n'`) - **Waveform selector** — triangle, sine, sawtooth, square — changes the oscillator type via `synth.set()` - **Audio context** — deferred until first user gesture (`Tone.start()`) - **Zero external resources** — no CDN, no audio files, fully self-contained
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
modelling-3.0-flash
vendorinclusionai
harnesspi-agent
generated2026-08-01
EVALUATION
★★★★★ 2/5 partial
Pentatonic pad grid UI renders with click feedback, but a JS error breaks sound triggering (triggerAttackRelease on null).
Vision grade · anthropic/claude-sonnet-5
MEASUREMENTS
Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.
idle motion0.0%
on click0.0%
on drag0.0%
on wheel0.0%
on enter + space0.0%
on arrow keys0.0%
on w/a/s/d0.0%
frame spread10.6 / 255
console errors0
js errors
- Cannot read properties of null (reading 'triggerAttackRelease')
METRICS
runtime74.7s
tokens in131k
tokens out25k
cached99k
cost / run$0.0000