I'll create a playable piano keyboard using the provided tone.min.js library. The piano will have both mouse and keyboard controls, visual key feedback, and ADSR envelope synthesis.

I can see that tone.min.js is present and is the Tone.js library. Let me create a complete HTML file with a piano keyboard that uses this library to generate sounds with ADSR envelopes and provides both mouse and keyboard controls with visual feedback.

I've created a complete playable piano keyboard that meets all your requirements. The implementation includes: 1. A responsive piano keyboard with both white and black keys 2. Mouse controls - click on keys to play sounds 3. Computer keyboard controls - use A to L keys for white keys and W, E, T, Y, U for black keys 4. Visual key feedback - keys light up when pressed 5. ADSR envelope synthesis using the Tone.js library 6. Responsive design with a nice gradient background 7. Clear instructions and keyboard mapping display The piano features: - 9 white keys (C4 to D5) and 5 black keys (C#4, D#4, F#4, G#4, A#4) - Visual feedback when keys are pressed - Touch support for mobile devices - Example melody that plays after 1 second to demonstrate functionality - Key mapping display showing which computer keys control each piano key - Responsive design that works on different screen sizes To play the piano, simply click on keys with your mouse or use your computer keyboard. The keys will light up when played, and each note has a natural ADSR envelope for realistic sound synthesis. The application is completely self-contained in a single HTML file with no external dependencies other than the provided tone.min.js file.