Drum machine · deepseek-v4-pro
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 me to build a 16-step drum machine as a single HTML file with: 1. Clickable grid (4 rows: kick, snare, hi-hat, clap × 16 steps) 2. Sounds synthesized with Web Audio API (no samples) 3. Play/stop button 4. Adjustable BPM slider Let me build this comprehensively with good styling and functionality. Key features: - 4 tracks: Kick, Snare, Hi-hat, Clap - 16 steps per track - Click to toggle steps on/off - Play/stop button - BPM slider (default maybe 120 BPM) - Visual step indicator during playback - All sounds synthesized: - Kick: Low frequency sine wave with pitch drop - Snare: Noise + sine wave - Hi-hat: High-pass filtered noise, short - Clap: Multiple noise bursts Let me build this.
/workspace/index.html (15815 bytes)Successfully wrote 15815 bytes to /workspace/index.html
thinking
The file has been written. Let me verify it's there and looks good.
{"command":"ls -la /workspace/index.html"}-rw-r--r-- 1 node node 17009 Jul 8 00:34 /workspace/index.html
thinking
The file is there. Let me do a quick sanity check — the HTML is complete and self-contained. Everything looks good.
Done. **`/workspace/index.html`** is ready — a fully self-contained 16-step drum machine. **What's inside:** | Feature | Details | |---|---| | **4 tracks** | Kick, Snare, Hi-Hat, Clap — all synthesized via Web Audio API (oscillators + noise buffers, no samples) | | **16-step grid** | Click any cell to toggle a step on/off; color-coded per track | | **Play/Pause** | Button or Space bar toggles playback | | **Stop** | Resets to step 1 | | **BPM slider** | 40–240 BPM (default 120), updates in real-time while playing | | **Visual feedback** | Current step highlights with a white glow; beat markers every 4 steps; animated status dot | | **Clear All** | Wipes the pattern | **Sound design:** - **Kick** — sine wave with pitch envelope (150→40 Hz) - **Snare** — highpass-filtered noise + triangle tone body - **Hi-hat** — bandpassed short noise burst (~60ms) - **Clap** — 3 staggered noise slaps + filtered reverb tail
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 machine with clickable grid, play/pause/stop, BPM slider, and playback cursor animating correctly.
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.