Drum machine · glm-4.6

Output generated Cost / run $0.0112 Runtime 291.0s

Prompt for this run

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.

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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

modelglm-4.6

vendorZ.ai · GLM

harnesspi-agent

generated2026-08-01

METRICS

runtime291.0s

tokens in7.9k

tokens out5.2k

cached7.8k

cost / run$0.0112

Transcript · 4 messages

user

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.

assistant

thinking

I need to create a single-page drum machine web app with the following requirements:
1. 16-step sequencer grid
2. 4 instruments: kick, snare, hi-hat, clap
3. Synthesized sounds using Web Audio API
4. Play/stop functionality
5. Adjustable BPM
6. All self-contained in one HTML file

Let me design this step by step:
1. Create a grid interface (16 steps x 4 instruments)
2. Implement Web Audio API synthesis for each drum sound
3. Add sequencer logic to step through the pattern
4. Add play/stop controls
5. Add BPM control
6. Style it nicely with CSS

I'll use a modern, clean design with visual feedback for the current playing step.

→ write /tmp/ws/index.html (22816 bytes)

toolResult

Successfully wrote 22816 bytes to /tmp/ws/index.html

assistant

thinking

Perfect! I've created a fully functional 16-step drum machine web app with all the requested features:

1. **16-step grid sequencer** - Visual grid with 16 steps for each instrument
2. **4 instruments** - Kick, Snare, Hi-hat, and Clap, each with their own color scheme
3. **Web Audio API synthesis** - All sounds are synthesized programmatically:
   - Kick: Sine wave oscillator with pitch sweep
   - Snare: Noise burst with tone
   - Hi-hat: High-pass filtered noise
   - Clap: Two filtered noise bursts for realistic clap sound
4. **Play/Stop controls** - Play button that becomes Pause when playing, plus Stop button
5. **Adjustable BPM** - Range from 60-200 BPM with real-time updates
6. **Additional features**:
   - Clear button to reset the pattern
   - Default beat pattern loaded on start
   - Visual feedback with current step highlighting
   - Responsive design for mobile
   - Smooth animations and transitions
   - Modern gradient design

The app is completely self-contained in a single HTML file with no external dependencies, ready to run in any modern browser with Web Audio API support.