Features:
- Custom application icon (MIDI + mixer design)
- Solo button functionality
- Main assignment and input source indicators (UI ready)
- Stereo channel dual L/R faders
- MIDI output for DAW recording
- Profile management with filter state
- Comprehensive documentation

UI Improvements:
- Cleaned up context menu
- Fixed MIDI indicator (no arrows)
- Changed filter button text to 'View: All/Mapped'
- Fixed solo button event handling

Documentation:
- Complete user guide in README
- Logic Pro setup instructions
- Troubleshooting guide
- Installation with Homebrew
- Fixed API dependency installation instructions