This is the new WH10V2 retrofit. It offers pre and post effect volume control, a fuzz friendly fuzz buffer, a vintage V1 replica potentiometer and Q control for the guitar settings and bass settings via internal DIP switches. The Pre-effect volume control is a trimmer located inside on the circuit board. The post effect volume control is offered on the exterior left front side of the pedal when looking at it from a players position. Tons of tonal options in this pedal!