MODE- Turns distortion on and off and sets the type. The LED above the MODE button illuminates when distortion is enabled.
Off- Distort effect is disabled.
Tube- Relatively mellow distortion mode. Use it to add just little bit of vintage hair to sounds.
Fuzz- Aggressive and raunchy vintage fuzz tone.
DRIVE- Overall amount of distortion.
TONE- Sets the brightness of tone.
LEVEL- Sets overall volume; this doesn't affect the amount of distortion. Increasing drive will cause an overall volume increase, Level can used to balance levels.