I've created a single-page web app with a playable piano keyboard that: 1. Uses the provided `tone.min.js` library for audio synthesis 2. Implements an ADSR envelope (Attack, Decay, Sustain, Release) for realistic sound 3. Provides visual feedback when keys are pressed (keys highlight) 4. Supports both mouse interaction and computer keyboard input (A to L keys for white keys, Z, X, C, V, B, N, M, comma, period, slash for black keys) 5. Includes proper positioning of black keys above white keys 6. All code is contained in one self-contained `index.html` file with inline CSS and JavaScript The piano features: - 14 white keys (C4 to C6) - 10 black keys (C#4, D#4, F#4, G#4, A#4, C#5, D#5, F#5, G#5, A#5) - Visual key highlighting on press - Smooth transitions for better user experience - Clear instructions at the top The app runs completely offline with no external resources or network requests.