Drum machine · qwen3.5-plus-02-15
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 for a drum machine with the following features: 1. 16-step sequencer grid 2. 4 instruments: kick, snare, hi-hat, and clap 3. All sounds synthesized with Web Audio API (no external samples) 4. Play/stop functionality 5. Adjustable BPM I need to create a self-contained index.html file with: - HTML structure for the grid and controls - CSS styling in a <style> tag - JavaScript in a <script> tag with Web Audio API synthesis Let me build this step by step in my mind: 1. HTML: A grid layout with 4 rows (one per instrument) and 16 columns (steps), plus controls for BPM and play/stop 2. CSS: Modern, clean styling for the grid with visual feedback for active steps and current playback position 3. JS: - Web Audio API context - Sound synthesis functions for each instrument - Sequencer logic with timing - Grid click handlers - BPM control Let me write this all into one file.
/tmp/ws/index.html (12980 bytes)Successfully wrote 12980 bytes to /tmp/ws/index.html
thinking
Done! I've created a complete 16-step drum machine in a single self-contained `index.html` file. Features include: - **4 instruments**: Kick, Snare, Hi-hat, and Clap - all synthesized with Web Audio API (no samples) - **16-step sequencer grid**: Click to toggle steps on/off - **Play/Stop controls**: Start and stop the sequencer - **Adjustable BPM**: Set tempo from 40-240 BPM - **Visual feedback**: Current step indicator with beat markers - **Sound preview**: Clicking a step plays the sound - **Modern UI**: Dark theme with neon accents and smooth animations The drum sounds are synthesized procedurally: - **Kick**: Oscillator with frequency sweep - **Snare**: Noise + triangle wave combination - **Hi-hat**: High-pass filtered noise - **Clap**: Multi-burst noise with bandpass filter
Done! Created `/tmp/ws/index.html` - a complete 16-step drum machine with: - **4 instruments**: Kick, Snare, Hi-hat, Clap (all Web Audio API synthesized) - **Clickable 16-step grid**: Toggle steps on/off with visual feedback - **Play/Stop controls**: Start and stop the sequencer - **Adjustable BPM**: 40-240 BPM range - **Beat markers**: Visual indicators for every 4th step - **Current step highlight**: Shows playback position in real-time - **Sound preview**: Clicking an active step plays the sound All sounds are synthesized procedurally (no external samples), and everything runs entirely in the browser with no network requests.
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
Drum machine grid with clickable cells toggling on click/drag, play/stop and BPM present; keyboard inputs have no effect.
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.