Drum machine · glm-4.5
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-page web app. Let me break down the requirements: 1. 16-step sequencer grid 2. 4 instruments: kick, snare, hi-hat, clap 3. All sounds synthesized using Web Audio API (no external samples) 4. Play/stop controls 5. Adjustable BPM 6. Everything in a single index.html file with inline CSS and JS 7. No external resources or CDNs Let me design this: **UI Layout:** - Header with title and BPM control - 4 rows (one per instrument) with 16 step buttons each - Play/Stop button - Visual indicator of current step **Sound Synthesis (Web Audio API):** - **Kick**: Oscillator (sine) with frequency sweep from high to low, short envelope - **Snare**: Noise buffer + oscillator, quick decay - **Hi-hat**: High-pass filtered noise, very short decay - **Clap**: Short burst of noise with envelope **Sequencer Logic:** - 16 steps, current step highlighted - On each step, check which instruments are active and trigger their sounds - BPM controls the interval between steps Let me write this complete application.
I'll create a 16-step drum machine with synthesized sounds using the Web Audio API. Let me build this complete single-page application.
/tmp/ws/index.html (18449 bytes)Successfully wrote 18449 bytes to /tmp/ws/index.html
thinking
I've created a complete 16-step drum machine with all the requested features. Let me verify the file was created correctly.
{"command":"ls -la /tmp/ws/index.html"}-rw-r--r--. 1 node node 18451 Aug 1 19:57 /tmp/ws/index.html
thinking
Done! I've built a complete 16-step drum machine in a single `index.html` file with: **Features:** - **16-step sequencer grid** with 4 tracks (Kick, Snare, Hi-Hat, Clap) - **Synthesized sounds** using Web Audio API: - Kick: Sine oscillator with frequency sweep from 150Hz → 40Hz - Snare: Layered noise + triangle oscillator for body - Hi-Hat: High-pass filtered noise at 7kHz - Clap: Triple noise burst with bandpass filter - **Play/Stop button** with visual state feedback - **BPM control** (60-180) with real-time adjustment - **Visual indicators**: Current step highlighted, beat markers every 4 steps - **Default pattern** pre-loaded (basic beat) - **Clear All** button to reset the pattern - **Click to preview** sounds when activating steps **Design:** - Dark gradient background with glassmorphism styling - Color-coded tracks (red kick, pink snare, yellow hi-hat, cyan clap) - Responsive layout that adapts to smaller screens - Smooth animations and hover effects - No external dependencies - runs completely sandboxed
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 renders correctly with clicks toggling cells, but no playback animation visible and keyboard inputs had 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.