Drum machine · step-3.7-flash

Output generated Cost / run $0.0078 Runtime 28.9s

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.

⛨ sandboxed Open in new tab ↗

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

modelstep-3.7-flash

vendorStepFun

harnesspi-agent

generated2026-07-22

METRICS

runtime28.9s

tokens in8.3k

tokens out5.4k

cached0

cost / run$0.0078

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

Let me build a single-page web app that is a 16-step drum machine with:
- Clickable 4-row × 16-column grid (kick, snare, hi-hat, clap)
- Web Audio API synthesized sounds (no external files)
- Play/Stop button
- Adjustable BPM
- Current step indicator
- All self-contained in one index.html file

I'll synthesize each drum sound using Web Audio API oscillators and noise:
- Kick: sine wave with frequency sweep from high to low, short decay
- Snare: noise burst + sine tone, short decay
- Hi-hat: filtered noise, very short decay
- Clap: filtered noise with multiple bursts (like a hand clap)

I should make it visually polished with a nice dark theme, animations, and a clear UI.

Let me write this directly to /workspace/index.html.

→ write /workspace/index.html (15500 bytes)

toolResult

Successfully wrote 15500 bytes to /workspace/index.html

assistant

thinking

The file is created successfully. Let me give a brief summary of what was built.

**`index.html` written to `/workspace/`. It includes:** - **16-step clickable grid** – 4 rows (Kick, Snare, Hi-Hat, Clap) × 16 columns, toggle pads on/off - **Synthesized drums via Web Audio API** — pure oscillators and noise buffers (no audio files or CDNs) - **Kick:** sine pitch sweep + body click - **Snare:** band-passed noise + triangle tone - **Hi-Hat:** high-passed white noise with fast decay - **Clap:** multiple short noise bursts with a filtered tail - **BPM control** — number input + slider (40–240), synced together - **Play/Stop** button — Spacebar shortcut too - **Visual feedback** — colored pads when active, column highlight for the current step, level meters under the grid - **Dark UI** — entirely self-contained in one file with no external resources (no network required)