Arpeggiator pad · hy3-preview
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.
transcript · 8 messages
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.
{"command":"ls /workspace/"}tone.min.js
/workspace/index.html (10729 bytes)Successfully wrote 10729 bytes to /workspace/index.html
thinking
The user asked me to build a single-page web app with a clickable pentatonic pad grid and an arpeggiator. I've already written the index.html file. Let me verify it's there and check if there are any issues. Looking at my code, I notice a few things I should verify: 1. The tone.min.js is loaded correctly with <script src="tone.min.js"></script> 2. The arpeggiator logic - I'm using setTimeout which isn't ideal for precise timing with Tone.js. I should probably use Tone.Transport or Tone.Loop for better timing. 3. The tempo calculation might be off - I should double check it. Actually, looking more carefully at the arpeggiator code: - I'm using setTimeout for scheduling which can drift - For better timing with Tone.js, I should use Tone.Transport or Tone.Loop - The interval calculation: (60 / tempo) * 500 - this gives half a second per beat at 120bpm, which is 8th notes... that seems wrong. At 120bpm, a quarter note is 500ms, so 8th notes would be 250ms. So (60/tempo)*250 would be correct for 8th notes. But actually I think the user said "adjustable tempo" and "arpeggiator sequence" - typically arps run at 16th or 8th notes. Let me reconsider the tempo calculation: - BPM = beats per minute (quarter notes) - Quarter note duration = 60 / BPM seconds - For 16th notes: (60 / BPM) / 4 = 15 / BPM seconds = (60 / BPM) * 0.25 * 1000 ms - For 8th notes: (60 / BPM) * 0.5 * 1000 ms Actually in my code I have: const intervalMs = (60 / tempo) * 500 At 120 BPM: (60/120)*500 = 0.5 * 500 = 250ms. That's 8th notes at 120bpm. That seems reasonable. But actually, using setTimeout for audio scheduling is not great. I should use Tone.Transport. Let me rewrite this to use proper Tone.js scheduling. Also, I just realized - the user said "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". I need to refactor the code to use Tone.Transport for precise timing and fix the tempo calculation. The current implementation with setTimeout will cause timing drift and inconsistent playback, especially at higher tem
I see a few issues with the current implementation - the arpeggiator uses `setTimeout` which causes timing drift, and the tempo calculation could be more precise. Let me rewrite it to use Tone.js's built-in Transport for accurate scheduling.
/workspace/index.html (12496 bytes)Successfully wrote 12496 bytes to /workspace/index.html
thinking
The user sent an empty message. They might be waiting for me to confirm the file was created successfully, or they might have accidentally sent an empty message. Let me verify the file exists and summarize what was built. I should check that the file was written correctly and maybe give a brief summary of what was created
The app is built and saved to `/workspace/index.html`. Here's what it includes: **Pentatonic Pad Grid** - 16 pads (8 columns × 2 rows) covering C4–C7 in C major pentatonic (C D E G A) - Click any pad to trigger a polyphonic synth voice with reverb - Keyboard shortcuts: `A`–`K` (top row), `Z`–`,` (bottom row) - Visual feedback: pads glow on trigger **Arpeggiator** - ▶ Play / ■ Stop button starts/stops a sequenced pattern using `Tone.Transport` + `Tone.Loop` for tight timing (no `setTimeout` drift) - **Tempo** slider: 40–240 BPM, updates live while playing - **Pattern** selector: Up, Down, Up-Down, Random - **Note duration** selector: 1/16, 1/8, 1/4 **Audio Chain** - Pad synth: `PolySynth` (triangle8) → `Filter` (lowpass 3500Hz) → `Reverb` (2.8s decay) → output - Arp synth: `PolySynth` (sine) → same filter/reverb chain - `Tone.start()` is called on first user gesture (button click) to unlock audio context Open `index.html` in a browser to use it.
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
EVALUATION
Static pentatonic pad grid with play/tempo controls renders correctly but shows no visual feedback to any tested input.
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.