Drum machine · qwen3.5-35b-a3b
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 self-contained HTML file. Requirements: 1. 16 steps (beats) 2. 4 tracks: kick, snare, hi-hat, clap 3. Clickable grid to toggle steps 4. All sounds synthesized with Web Audio API (no external samples) 5. Play/stop functionality 6. Adjustable BPM I'll create a complete HTML file with: - CSS for styling the grid and controls - JavaScript for: - Web Audio API sound synthesis for each drum sound - Sequencer logic for stepping through 16 steps - Play/stop controls - BPM adjustment - Click handlers for the grid Let me write this as a single index.html file.
/tmp/ws/index.html (17294 bytes)Successfully wrote 17294 bytes to /tmp/ws/index.html
thinking
The file has been written successfully. Let me verify it exists and provide a summary of what was created.
{"command":"ls -la /tmp/ws/index.html"}-rw-r--r--. 1 node node 17296 Aug 1 19:54 /tmp/ws/index.html
thinking
The file exists and has been created successfully. Now I can summarize what was built.
Done! I've created a self-contained 16-step drum machine in `/tmp/ws/index.html`. Here's what's included: **Features:** - **16-step grid** with 4 tracks: Kick, Snare, Hi-Hat, and Clap - **Web Audio API synthesis** - all sounds are generated in real-time: - Kick: sine wave with exponential frequency decay - Snare: noise buffer + triangle oscillator - Hi-Hat: high-frequency noise with bandpass filtering - Clap: multi-burst noise with bandpass filter - **Clickable grid** - click any step to toggle it on/off - **Visual feedback** - steps light up with colored glow when active, show playing position - **Play/Stop buttons** - controls playback - **Adjustable BPM** - slider from 60-200 BPM with live display - **Keyboard shortcuts** - Space to play, Escape to stop **Styling:** - Dark theme with gradient background - Color-coded tracks (red=Kick, teal=Snare, yellow=Hi-Hat, green=Clap) - Responsive layout with hover animations - Step grouping every 4 beats for visual clarity Open `index.html` in a browser to use it. The audio context initializes on first interaction (play button or step click) as required by Web Audio API policies.
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, working toggle clicks, play/stop, and BPM slider.
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.