Jim Dunlop TVP-1 Tremolo and Volume

Another one of those pedals in which the rate is conrolled by a rocker. In the tremolo mode you can choose between either a square or triangle wave to modulate the volume by kicking a switch on the side and there's a knob to control the depth. Kick a different switch and it becomes a volume pedal. Therefore you can vary your attack like Jan Akkerman without having to exercise your pinky on your guitar's volume knob.