Ch 1 (Clean/Yellow): gain, bass, middle, treble, contour, power amp gain volume, 3 positions pre eq, gain boost
Ch 2 & Ch 3 (Blue & Red): gain, bass, middle, treble, contour, power amp gain, volume, 3 positions pre eq, gain-structure, gain boost and plexi mode
All channels have a 3 positions Pre EQ switch : Normal, Bright and Brighter. The higher you set the gain control, the less effect the Pre EQ will have on the sound. All channels also have a gain boost.
Channel 2 & 3 (Blue & Red) have two other switches to give the user different gain/tone :
The Plexi channel is a lower gain channel than the normal Blue & Red ones. The plexi channel can be assigned to either Channel 2 or 3. Note: structure switch and Gain Boost switch are inactive in Plexi mode.
The Structure switch is an overall gain reduction switch for Channels 2 & 3. When ON (high position), both channels 2 & 3 have less gain. Obviously, when OFF (down position), the preamp will more gain.