Drum machine · qwen3.5-plus-20260420
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 · 6 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 a drum machine web app in a single HTML file with: 1. 16-step sequencer grid 2. 4 instruments: kick, snare, hi-hat, clap 3. All sounds synthesized with Web Audio API (no samples) 4. Play/stop button 5. Adjustable BPM Let me build this with a clean, modern UI. I'll need to synthesize each drum sound using oscillators and noise. Let me design the sound synthesis: - Kick: Low frequency oscillator with pitch envelope - Snare: Mix of noise and oscillator - Hi-hat: High-pass filtered noise, short - Clap: Noise bursts with filtering For the UI: - Grid layout with 16 columns and 4 rows - Each cell is clickable to toggle on/off - Current step indicator - Play/stop button - BPM slider - Visual feedback for the current step
/tmp/ws/index.html (12707 bytes)Successfully wrote 12707 bytes to /tmp/ws/index.html
{"command":"ls -la /tmp/ws/index.html"}-rw-r--r--. 1 node node 12713 Aug 1 19:57 /tmp/ws/index.html
thinking
Great, the file is successfully created. Let me summarize what was built.
Done! `/tmp/ws/index.html` is ready. Here's what's included: **Drum Machine Features:** - **4 instruments**: Kick, Snare, Hi-Hat, Clap — each with unique synthesized sounds via Web Audio API - **16-step grid**: Click any cell to toggle it on/off; clicking an "on" cell also previews that sound - **Play/Stop button**: Starts/stops the sequencer - **Adjustable BPM**: Slider from 60–200 BPM with live display; changes take effect immediately while playing - **Clear button**: Resets the entire grid - **Visual feedback**: Current step highlighted with a white border; color-coded rows (red kick, orange snare, yellow hi-hat, green clap); beat markers every 4 steps - **Fully self-contained**: No external resources — all CSS and JS inline, runs completely offline
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 kick/snare/hi-hat/clap rows, BPM slider, play/clear; click toggles a cell but keyboard 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.