Drum machine · qwen3.7-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 · 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 single-page drum machine app with: - 16 steps (grid) - 4 sounds: kick, snare, hi-hat, clap - Web Audio API for sound synthesis (no external samples) - Play/Stop button - Adjustable BPM - Everything in one index.html file Let me design this carefully: **Sound Synthesis:** - **Kick**: Low frequency sine wave with pitch envelope (quick sweep from ~150Hz to ~30Hz), short duration - **Snare**: Mix of noise (filtered white noise through bandpass) + tone (triangle oscillator at ~200Hz) - **Hi-hat**: High-pass filtered white noise, very short decay - **Clap**: Short bursts of noise (multiple quick noise pulses to simulate clap) **UI Design:** - Clean, modern dark theme - 16 columns (steps) × 4 rows (instruments) - Visual step indicator showing current position - Play/Stop button prominently displayed - BPM slider or input - Color-coded instruments Let me build this out fully.
/tmp/ws/index.html (16445 bytes)Successfully wrote 16445 bytes to /tmp/ws/index.html
thinking
The file has been written. Let me verify it exists and looks correct.
{"command":"ls -la /tmp/ws/index.html"}-rw-r--r--. 1 node node 16457 Aug 1 17:41 /tmp/ws/index.html
thinking
File exists. Let me provide a summary of what was built.
Done — `/tmp/ws/index.html` is ready. Here's what it includes: **4 Instruments, all Web Audio API synthesized:** | Instrument | Synthesis method | |---|---| | **Kick** | Sine oscillator with fast pitch drop (160→30 Hz) + exponential gain decay | | **Snare** | Triangle oscillator tone + bandpass-filtered white noise burst | | **Hi-Hat** | High-pass filtered white noise, very short (~70 ms) decay | | **Clap** | 3 quick bursts of bandpass-filtered noise to mimic real claps | **Features:** - **16-step × 4-row grid** — click any cell to toggle; clicking an active cell previews the sound - **Play/Stop** button (or press **Space**) with step-position indicator that sweeps across the grid - **BPM control** — slider + number input, range 40–240 - **Color-coded rows** — pink/kick, orange/snare, yellow/hi-hat, green/clap - **Beat markers** every 4 steps for easy counting - **No external resources** — completely self-contained, runs sandboxed
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 with kick/snare/hi-hat/clap rows, BPM slider, play/stop; click toggles steps, space starts playback.
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.