Piano synth · mimo-v2.5-pro

Output generated Cost / run $0.0083 Runtime 77.4s

Prompt for this run

Using the pre-provided tone.min.js (global Tone), build a playable piano keyboard controlled by mouse and computer keys that synthesizes notes with an ADSR envelope and visual key feedback.

⛨ 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

modelmimo-v2.5-pro

vendorXiaomi · MiMo

harnesspi-agent

generated2026-07-22

METRICS

runtime77.4s

tokens in11k

tokens out5.6k

cached2.7k

cost / run$0.0083

Transcript · 6 messages

user

Using the pre-provided tone.min.js (global Tone), build a playable piano keyboard controlled by mouse and computer keys that synthesizes notes with an ADSR envelope and visual key feedback.

assistant

thinking

The user wants me to build a playable piano keyboard web app using Tone.js. Let me first check that tone.min.js exists in the current directory, then build the app.

Key requirements:
1. Piano keyboard UI
2. Mouse and computer keyboard controls
3. ADSR envelope synthesis
4. Visual key feedback
5. All in one index.html file
6. Uses the local tone.min.js fileLet me create a comprehensive piano app.

→ bash {"command":"ls -la /workspace/tone.min.js"}

toolResult

-rw-r--r-- 1 node node 349169 Jul 22 17:51 /workspace/tone.min.js

assistant

thinking

Good, tone.min.js exists. Now let me build the piano keyboard app.

→ write /workspace/index.html (16548 bytes)

toolResult

Successfully wrote 16548 bytes to /workspace/index.html

assistant

thinking

The file has been written. Let me verify it's all there and looks good.

The piano is built at `/workspace/index.html`. Here's what it includes: **🎹 Features** | Feature | Details | |---|---| | **Synthesis** | `Tone.PolySynth` with 20-voice polyphony, ADSR envelope controls | | **Waveforms** | Triangle (default), Sine, Square, Sawtooth — switchable via dropdown | | **Mouse play** | Click/hold any key; pointer events with `pointerdown/up/leave` | | **Keyboard play** | Lower row `Z S X D C V G B H N J M` = notes C–B (left octave), Upper row `Q 2 W 3 E R 5 T 6 Y 7 U` = notes C–B (right octave) | | **Visual feedback** | Keys darken with inset shadow when active (both mouse and keyboard) | | **Key labels** | Each key shows its note name + the computer key binding | | **Octave shift** | ◀/▶ buttons shift the entire keyboard up/down (range C0–B7) | | **Volume** | Master volume slider (dB) | | **Audio init** | Auto-starts the `AudioContext` on first user gesture | Open it in a browser (served locally or directly as a file) and start playing — all in one self-contained HTML file with no external dependencies beyond the local `tone.min.js`.