Panel overview The Monotone front panel contains the following sections: The Monotone front panel sections. • 1. MIDI Note On LED. • 2. Patch Selector (for browsing, loading and saving patches). • 3. Master Volume. • 4. Voicing section and global controls. • 5. Oscillator section. • 6. Filter section. • 7. Amplitude Envelope. • 8. Chorus section. • 9. Delay section. • 10. Modulation section.