I'll create a single-page web app with a pentatonic pad grid and arpeggiator using Tone.js. The app will have clickable pads that trigger synth voices with reverb, plus a play/stop button for an arpeggiator sequence at adjustable tempo. First, let me check if tone.min.js is available in the current directory:

Great! tone.min.js is available in the current directory. Now I'll create the index.html file with the pentatonic pad grid and arpeggiator functionality. I'll build a web app that: 1. Creates a pentatonic scale (C, D, E, G, A) with clickable pads 2. Uses Tone.js to generate sound with reverb 3. Includes a play/stop button for an arpeggiator sequence 4. Allows adjusting tempo Here's the complete implementation:

I've created a complete single-page web app with the following features: 1. A pentatonic pad grid (C, D, E, G, A) that triggers synth voices with reverb when clicked 2. A play/stop button for an arpeggiator sequence 3. Adjustable tempo control (40-240 BPM) 4. All sound is synthesized using Tone.js with no external audio files The implementation includes: - CSS styling for a clean, responsive interface - JavaScript that initializes Tone.js and creates the synth with reverb - Clickable pads that trigger individual notes - An arpeggiator that plays a sequence of C, D, E, G, A - Tempo adjustment that affects the arpeggiator's speed - UI feedback for play/stop state The app is fully self-contained in index.html and uses the pre-provided tone.min.js file. index.html has been created successfully in the current directory.