Drum machine · qwen3.5-397b-a17b
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.
transcript · 4 messages
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.
thinking
The user wants me to create a single-page drum machine web app with the following features: 1. 16-step sequencer grid 2. 4 instrument tracks: kick, snare, hi-hat, and clap 3. Clickable grid cells to toggle steps on/off 4. All sounds synthesized with Web Audio API (no external samples) 5. Play/Stop controls 6. Adjustable BPM I'll create a complete, self-contained index.html file with: - CSS for styling the grid and controls - JavaScript for the Web Audio API synthesis and sequencer logic - HTML for the UI structure Let me build this step by step in one file.
/tmp/ws/index.html (12592 bytes)Successfully wrote 12592 bytes to /tmp/ws/index.html
thinking
The file has been created successfully. Let me verify it exists.
Done! Created `/tmp/ws/index.html` - a complete 16-step drum machine with: **Features:** - **4 instrument tracks**: Kick, Snare, Hi-Hat, and Clap - **16-step sequencer grid** - click cells to toggle steps on/off - **Web Audio API synthesis** - all sounds generated procedurally (no samples) - **Play/Stop button** - starts/stops the sequencer - **Adjustable BPM** - slider from 60-200 BPM with live display - **Clear button** - resets the pattern - **Visual playhead** - highlights the current step as it plays - **Beat markers** - every 4th step has extra spacing for visual rhythm **Sound synthesis:** - **Kick**: Oscillator with frequency sweep from 150Hz down - **Snare**: High-pass filtered noise + triangle oscillator body - **Hi-Hat**: High-pass filtered noise (7kHz+) - **Clap**: Band-pass filtered noise with exponential envelope Open `index.html` in a browser to use it. Click any grid cell to program a pattern, then hit Play!
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
16-step drum grid with BPM slider and play/clear buttons; click toggles a step, but keyboard input has no effect.
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.