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Arpeggiator pad · seed-2.0-code

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
Let me build this pentatonic pad grid app with Tone.js. I need to:

1. Create a clickable grid of pentatonic scale notes
2. Add a synth voice with reverb
3. Include a play/stop button for an arpeggiator
4. Add tempo control
5. Make it a single self-contained HTML file

First, let me check if tone.min.js exists in the current directory.
bash {"command":"ls -la /tmp/ws"}
toolResult

total 344 drwxr-sr-x. 2 node node 25 Aug 13 01:24 . drwxrwsrwx. 3 root node 16 Aug 13 01:24 .. -rw-r--r--. 1 node node 349169 Aug 13 01:24 tone.min.js

assistant
thinking
Great, tone.min.js exists. Now I'll create the index.html file with the pentatonic pad grid, synth with reverb, arpeggiator, and tempo control.
write /tmp/ws/index.html (18628 bytes)
toolResult

Successfully wrote 18628 bytes to /tmp/ws/index.html

assistant
thinking
Let me verify the file was created correctly by checking its contents.
bash {"command":"ls -la /tmp/ws"}
toolResult

total 364 drwxr-sr-x. 2 node node 43 Aug 13 01:25 . drwxrwsrwx. 3 root node 16 Aug 13 01:24 .. -rw-r--r--. 1 node node 18636 Aug 13 01:25 index.html -rw-r--r--. 1 node node 349169 Aug 13 01:24 tone.min.js

assistant
thinking
Perfect! The index.html file has been created successfully. Let me just quickly verify it loads tone.min.js correctly by checking the script tag reference.
read {"path":"/tmp/ws/index.html","limit":20}
toolResult

<!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> <script src="tone.min.js"></script> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%); min-height: 100vh; display: flex; flex-direction: column; [570 more lines in file. Use offset=21 to continue.]

assistant
thinking
The index.html file has been created successfully with all the required features:

1. **Pentatonic Pad Grid**: A 5x5 grid of pads with notes from the pentatonic scale across multiple octaves
2. **Synth Voice with Reverb**: Uses Tone.js with two oscillators (sine and triangle) for a warm pad sound, plus reverb and delay effects
3. **Play/Stop Arpeggiator**: A button to start/stop an arpeggiator sequence
4. **Adjustable Tempo**: A slider to control the tempo from 60 to 200 BPM
5. **Pattern Selection**: Multiple arpeggiator patterns (Up, Down, Up-Down, Random)
6. **Visual Feedback**: Pads light up when active, arpeggiator status indicator
7. **Responsive Design**: Works on mobile devices with smaller pads

The file uses the local tone.min.js library as requested, with no external CDNs or network requests.

The pentatonic pad grid app has been successfully created in `/tmp/ws/index.html`. This interactive music app features: - **5x5 Clickable Pad Grid**: Pentatonic scale notes (C, D, E, G, A) across 5 octaves - **Warm Pad Synthesizer**: Two detuned oscillators (sine + triangle) with envelope shaping - **Reverb & Delay Effects**: Spatial audio processing for a lush sound - **Arpeggiator**: - Play/Stop button with visual indicator - Adjustable tempo (60-200 BPM) with slider control - Multiple pattern options: Up, Down, Up-Down, Random - **Visual Feedback**: Active pads glow, playing state indicator - **Responsive Design**: Works on both desktop and mobile devices All audio is synthesized in real-time using the local `tone.min.js` library with no external resources or network requests. To use, simply open `index.html` in a web browser.

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

modelseed-2.0-code
vendorByteDance · Seed
harnesspi-agent
generated2026-08-13

EVALUATION

4/5 working

Clean pentatonic pad grid with tempo/pattern controls; click highlights a pad, Enter+Space toggles Start Arp button focus state.

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 motion0.2%
on click0.4%
on drag0.4%
on wheel0.2%
on enter + space17.4%
on arrow keys0.2%
on w/a/s/d0.2%
frame spread47.3 / 255
console errors0
js errors none

METRICS

runtime91.2s
tokens in26k
tokens out5.6k
cached19k
cost / run$0.0203