Drum machine · qwen3.5-27b
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 create a single-page web app that is a 16-step drum machine with: 1. A clickable grid for kick, snare, hi-hat, and clap 2. All sounds synthesized with Web Audio API (no external samples) 3. Play/stop functionality 4. Adjustable BPM I'll create a complete index.html file with embedded CSS and JavaScript that does all of this. Let me build this step by step: 1. HTML structure with the grid layout 2. CSS for styling the drum machine interface 3. JavaScript for: - Web Audio API sound synthesis for each drum type - Step sequencer logic - Play/stop controls - BPM adjustment - Grid interaction Let me write this comprehensive file.
/tmp/ws/index.html (15957 bytes)Successfully wrote 15957 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 and has content.
{"command":"ls -la /tmp/ws/index.html && head -5 /tmp/ws/index.html && echo \"...\" && tail -5 /tmp/ws/index.html"}-rw-r--r--. 1 node node 15969 Aug 1 19:55 /tmp/ws/index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> ... initGrid(); renderGrid(); </script> </body> </html>
thinking
The file has been created successfully. Let me provide a summary of what was built.
Done! Created `/tmp/ws/index.html` - a complete 16-step drum machine with: **Features:** - **4 Drum Tracks**: Kick, Snare, Hi-hat, and Clap - **Web Audio API Synthesis**: All sounds are synthesized in real-time (no samples) - Kick: Oscillator with pitch envelope - Snare: Triangle wave + filtered white noise - Hi-hat: High-passed noise burst - Clap: Multi-peak noise envelope for clap-like sound - **Interactive Grid**: Click any step to toggle it on/off (with preview sound) - **Play/Stop Controls**: Start and stop the sequencer - **Adjustable BPM**: Input field (40-240 BPM) - **Visual Feedback**: Steps light up as they play, active steps glow - **Keyboard Shortcut**: Press SPACE to play/pause **Design:** - Modern dark gradient UI with colorful drum tracks - Responsive layout with smooth animations - Beat markers (every 4th step slightly dimmed) Just open `index.html` in a browser and click steps to create your pattern, then hit Play!
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 kick/snare/hihat/clap rows, BPM control, and playhead animates when playing via space/keys, but click/drag/wheel didn't toggle steps.
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.