BAXSTABBER is a EQ/preamp/tone shaper and possible level boost that takes any signal you feed it and applies the famous Baxandall EQ (simple treble and bass control with variable mid control based on where you set the T & B) with 144 different tone stacks of his/her choice via the two (2) 12-position rotary potentiometers (the pointy yellow and green knobs).