Drum machine · qwen3.6-flash

Output generated Cost / run $0.0080 Runtime 33.1s

Prompt for this run

Build a 16-step drum machine with a clickable grid for kick, snare, hi-hat, and clap, all sounds synthesized with the Web Audio API, plus play/stop and an adjustable BPM.

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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

modelqwen3.6-flash

vendorQwen

harnesspi-agent

generated2026-08-01

METRICS

runtime33.1s

tokens in8.5k

tokens out5.7k

cached0

cost / run$0.0080

Transcript · 4 messages

user

Build a 16-step drum machine with a clickable grid for kick, snare, hi-hat, and clap, all sounds synthesized with the Web Audio API, plus play/stop and an adjustable BPM.

assistant

thinking

The user wants a single-page drum machine web app with:
- 16 steps (grid)
- 4 instruments: kick, snare, hi-hat, clap
- Sounds synthesized with Web Audio API
- Play/stop controls
- Adjustable BPM
- All in one index.html file

Let me build this step by step. I need to synthesize realistic-sounding drums using Web Audio API oscillators and noise buffers.

Sound synthesis approach:
- Kick: low-frequency sine wave with pitch envelope + quick click/noise burst
- Snare: noise burst + triangle oscillator "tone" component
- Hi-hat: filtered high-frequency noise (bandpass), short decay
- Clap: multiple noise bursts shaped to simulate handclaps

Grid: rows = instruments, columns = 16 steps
UI needs to be visually appealing and functional.

→ write /tmp/ws/index.html (15356 bytes)

toolResult

Successfully wrote 15356 bytes to /tmp/ws/index.html

assistant

thinking

The file is written. Let me verify it exists and looks correct.

Done. Here's what I built in `/tmp/ws/index.html`: **Drum Machine — 4 instruments × 16 steps** - **Instruments:** Kick, Snare, Hi-Hat, Clap — all synthesized live with Web Audio API (no samples) - **Grid:** Click any cell to toggle it on/off; clicking an active cell plays a preview of that sound - **Controls:** Play/Stop button, BPM slider (40–240), Clear All button - **Keyboard:** Press `Space` to play/stop - **Visuals:** Color-coded rows (red/orange/green/purple), playing-step indicator pulses, shimmer title ### Sound synthesis details: | Instrument | Method | |------------|--------| | **Kick** | Sine oscillator pitched down from 160→35 Hz + triangle transient click | | **Snare** | Band-passed white noise burst + triangle osc "tone" body | | **Hi-Hat** | High-pass filtered noise through bandpass (~10 kHz) | | **Clap** | Filtered noise with multi-burst envelope mimicking hand-clap layers |