The Kanagawa Tremolo is a genuine tube tremolo driven by an old stock 12AU7 tube. Besides the knob that controls the speed of the wave, there is a switch to select fast or slow. Because of the volume control, you can set it to equal volume, or have it boost your signal when engaged. With the depth down, the pedal acts as a great tube boost pedal. With medium output humbuckers or single-coils, the tube does not add much dirt to the signal, but when driven by a boost or hot pickups, the tube will overdrive a bit more. Very versatile pedal.