Drum machine · step-3.7-flash
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
Let me build a single-page web app that is a 16-step drum machine with: - Clickable 4-row × 16-column grid (kick, snare, hi-hat, clap) - Web Audio API synthesized sounds (no external files) - Play/Stop button - Adjustable BPM - Current step indicator - All self-contained in one index.html file I'll synthesize each drum sound using Web Audio API oscillators and noise: - Kick: sine wave with frequency sweep from high to low, short decay - Snare: noise burst + sine tone, short decay - Hi-hat: filtered noise, very short decay - Clap: filtered noise with multiple bursts (like a hand clap) I should make it visually polished with a nice dark theme, animations, and a clear UI. Let me write this directly to /workspace/index.html.
/workspace/index.html (15500 bytes)Successfully wrote 15500 bytes to /workspace/index.html
thinking
The file is created successfully. Let me give a brief summary of what was built.
**`index.html` written to `/workspace/`. It includes:** - **16-step clickable grid** – 4 rows (Kick, Snare, Hi-Hat, Clap) × 16 columns, toggle pads on/off - **Synthesized drums via Web Audio API** — pure oscillators and noise buffers (no audio files or CDNs) - **Kick:** sine pitch sweep + body click - **Snare:** band-passed noise + triangle tone - **Hi-Hat:** high-passed white noise with fast decay - **Clap:** multiple short noise bursts with a filtered tail - **BPM control** — number input + slider (40–240), synced together - **Play/Stop** button — Spacebar shortcut too - **Visual feedback** — colored pads when active, column highlight for the current step, level meters under the grid - **Dark UI** — entirely self-contained in one file with no external resources (no network required)
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 grid works: click toggles cell, drag/keys move playhead, Play/Stop and BPM functional.
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.