LEVEL: output level of the effect.
BLEND: Level of the clean signal, which is added in parallel to the distortion. This clean signal is filtered to keep only the lower frequencies, and allows you to get the desired bottom end in all levels of distortion. Match appropiately with the Level control.
TREBLE: Treble control. Turn to the right for an open and bright tone, and to the left for a darker sound.
GAIN: Amount of gain applied at the input of the pedal. This gain is centered around the low and mid-low frequencies, and allows you to get sounds with more weight and growl.
DIST: Gain of the distortion stage. This control is centered on the higher mids, and allows you to get high levels of distortion on that range of frequencies.
TRUE BYPASS: Turns on/off the effect. The true bypass switch keeps your sound intact when the effect is off.