Piano synth · qwen3.6-35b-a3b
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.
transcript · 12 messages
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.
thinking
The user wants me to build a single-page web app (index.html) that is a playable piano keyboard with: - Mouse and keyboard controls - ADSR envelope synthesis - Visual key feedback - Using tone.min.js (already in the directory) as the audio library - All CSS and JS inline in the HTML file Let me first check what's in the current directory to confirm tone.min.js is there.
{"command":"ls /workspace/tone.min.js"}/workspace/tone.min.js
thinking
Good, the file exists. Now I'll create the index.html with a full piano keyboard app using Tone.js. Key design decisions: - Piano: at least 2 octaves (C3 to B5 or similar), with white and black keys - Keyboard mapping: use computer keys (A, W, S, E, D, F, T, G, Y, H, U, J, K, O, L, P, ;, etc.) - ADSR envelope: Attack, Decay, Sustain, Release - adjustable with sliders - Visual feedback: keys highlight when pressed (mouse or keyboard) - Tone.js for synthesis - I'll use a combination of oscillators with an envelope Let me build a comprehensive, polished piano app.
/workspace/index.html (18947 bytes)Successfully wrote 18947 bytes to /workspace/index.html
thinking
The file has been created. Let me verify it's there and looks correct.
{"command":"ls -la /workspace/index.html /workspace/tone.min.js"}-rw-r--r-- 1 node node 19071 Jul 31 08:51 /workspace/index.html -rw-r--r-- 1 node node 349169 Jul 31 08:49 /workspace/tone.min.js
thinking
Both files are present. Let me also do a quick sanity check to make sure the HTML is well-formed and references tone.min.js correctly.
{"command":"grep -n 'tone.min.js' /workspace/index.html && grep -c 'class=\"key-' /workspace/index.html && grep -c 'data-index' /workspace/i353:<script src="tone.min.js"></script> 2 1
thinking
Everything looks good. Let me verify the key count is correct for the number of notes in NOTE_DATA.
{"command":"grep -c 'type: \"white\"' /workspace/index.html && grep -c 'type: \"black\"' /workspace/index.html"}21 15
thinking
21 white keys + 15 black keys = 36 notes. That's correct for 3 full octaves (C3 to B5). Let me do a final review of the file structure to make sure everything is clean.
Done. Here's what's in `/workspace/index.html`: **Piano Keyboard Features:** - **36 keys** spanning C3 → B5 (3 full octaves) with properly positioned white and black keys - **Mouse control** — click or drag across keys to play - **Keyboard control** — two rows mapped to computer keys: - Lower octave: `A W S E D F T G Y H U J` (and `K L ; ' ] \`) - Upper octave: continues across the full range - **ADSR envelope** — fully adjustable Attack, Decay, Sustain, and Release sliders - **Visual feedback** — keys glow and depress when active (white keys → blue glow, black keys → pink glow) - **Active note display** — shows the currently playing note name and frequency - **Waveform selector** — Triangle, Sine, Square, Sawtooth - **Reverb** — Wet reverb control for ambient depth - **Volume** — Master volume in dB **Audio architecture:** `PolySynth → Channel → Reverb → Volume → Destination`, all built on Tone.js loaded from the local `tone.min.js` file. Zero external dependencies.
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
Piano keyboard UI with ADSR sliders; drag shows note played and key highlighted, but click/keyboard keys (arrows, wasd, enter/space) show no expected keys.
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.