From the manufacturer: One of the tightest and most aggressive form of your favorite black and white rodent. The Mountain (V3) is a highly tuned OD/Dist/Fuzz circuit built for heavy riffs and saturated goodness. Tones from Floyd to Bongripper this pedal will fit anywhere on a board where distortion is needed. • The right toggle switch for Distortion and OD mode has now been moved to it’s own foot switch for ease on stage use and just a great feature for when transitioning between light and heavy passages on a song or cleaning up for lead. • The left toggle cycles through the clipping modes.– 1st is a compressed symmetrical Silicon true to the original– 2nd is an Asymmetrical Silicon that gives it a more lively and fuller tone but still keeping the gain– 3rd is a Hybrid that’s thats a full on brick house of a setup Clipping was setup in a way to increase Db and aggression as you select through. • Volume – is the overall volume.• Freq – is the tonal spectrum of the pedal. Counter for a fat thicker tone and Max it for an aggressive thrash like sound.• Gain – is the overall gain control.