Drum machine · qwen3.5-flash-02-23
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
The user wants me to create a single-page web app that's a drum machine with: - 16-step sequencer grid - 4 tracks: kick, snare, hi-hat, clap - All sounds synthesized with Web Audio API (no samples) - Play/stop button - Adjustable BPM Let me build this as a single self-contained HTML file with inline CSS and JavaScript. Key features to implement: 1. Visual step grid (16 steps × 4 tracks) 2. Clickable cells to toggle notes on/off 3. Web Audio API synthesis for each drum sound - Kick: sine wave with pitch drop - Snare: noise buffer + short envelope - Hi-hat: high-pass filtered noise - Clap: multiple noise bursts 4. Play/Stop control 5. BPM slider or input I'll create a clean, functional design with clear visual feedback for the current step.
/tmp/ws/index.html (16198 bytes)Successfully wrote 16198 bytes to /tmp/ws/index.html
thinking
I've created a complete single-page drum machine with all the requested features: 1. ✓ 16-step grid 2. ✓ Four instruments: kick, snare, hi-hat, and clap 3. ✓ Clickable grid to toggle steps on/off 4. ✓ All sounds synthesized using Web Audio API 5. ✓ Play/Stop button 6. ✓ Adjustable BPM (slider from 60-180) The file is self-contained with CSS in `<style>` tags and JS in `<script>` tags, no external resources or network requests needed. There's also a starter pattern pre-loaded so it's immediately usable when opened.
I've created `index.html` — a complete 16-step drum machine with: **Features:** - **Clickable grid**: 16 steps × 4 instruments (kick, snare, hi-hat, clap) - **Web Audio synthesizers**: Each instrument uses custom OSC + filter/noise synthesis - Kick: Oscillator with frequency sweep - Snare: Noise burst + triangle wave - Hi-hat: Bandpass-filtered noise - Clap: Multi-burst noise envelope - **Play/Stop button**: Large circular button, color changes when playing - **BPM slider**: Adjustable from 60–180 BPM with real-time update - **Visual feedback**: Current step highlighting, beat markers every 4 steps - **Color-coded tracks**: Cyan kick, red snare, orange hi-hat, green clap - **Pre-loaded pattern**: A basic beat starts ready to play No external resources — everything runs offline with pure Web Audio API and vanilla JS. Just open the file in a browser!
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 grid with kick/snare/hi-hat/clap, play button, BPM slider; click toggled a cell but no play animation observed
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.