Drum machine · qwen3.5-122b-a10b
Output generated Cost / run $0.0140 Runtime 35.8s
Prompt for this run
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.
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.
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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 drum machine web app with: 1. 16-step sequencer grid 2. 4 drum sounds: kick, snare, hi-hat, clap (all synthesized with Web Audio API) 3. Play/stop button 4. Adjustable BPM control 5. All in one self-contained index.html file with inline CSS and JS Let me create this step by step. I'll need to: 1. Create the HTML structure with a grid for each instrument 2. Style it with CSS 3. Implement the Web Audio API synthesizers for each drum sound 4. Build the sequencer logic with play/stop and BPM controls For the drum synthesis: - Kick: Oscillator with pitch envelope (start high, drop quickly) - Snare: Noise burst + oscillator snap - Hi-hat: High-pass filtered noise with short decay - Clap: Multiple noise bursts with slight timing offsets Let me write this complete file.
/tmp/ws/index.html (16437 bytes)Successfully wrote 16437 bytes to /tmp/ws/index.html
thinking
I've created the drum machine. Let me verify it was written correctly by checking if the file exists.
{"command":"ls -la /tmp/ws/index.html"}-rw-r--r--. 1 node node 16439 Aug 1 19:55 /tmp/ws/index.html
thinking
The file was created successfully. Let me provide a summary of what was built.
Done! The drum machine is ready at `/tmp/ws/index.html`. **Features:** - **16-step sequencer** with 4 tracks: Kick, Snare, Hi-Hat, Clap - **Synthesized sounds** using Web Audio API (no samples needed): - Kick: Oscillator with pitch drop envelope - Snare: Noise burst + triangle wave body - Hi-Hat: High-pass filtered noise - Clap: Multiple delayed noise bursts for that "clap" effect - **Play/Stop buttons** (also works with Spacebar) - **Adjustable BPM** (60-200) with slider and live display - **Visual feedback**: Steps light up as they play, beat markers every 4 steps - **Default pattern** loaded on start (classic rock beat) Just open `index.html` in a browser and click Play to hear it!