www.ramblefx.com/#!marvel-drive/cee5 The Ramble FX Marvel Drive has Dual “blended volume” gain controls that simulate a vintage 1959/1987x Marshall Plexi with patched inputs. The Marvel is a JFET design with 4 gain stages, all of which add to the distortion and harmonics, responding much like tubes in an amplifier. The ‘HIGH TREBLE’ and ‘NORMAL’ are in parallel and can be mixed together on the Ramble Fx Marvel Drive to give you tonal flexibility. There are No clipping diodes in the circuit of the Marvel Drive.