Carl Martin Plexi-Tone is a guitar effect pedal designed to produce sound modulations by applying effects such as Overdrive. To provide the musicians with an option to control the desired aspects of their instrument's tone, this Stompbox unit is equipped with the following controls: Tone Knob, Level Knob, Boost Footswitch, Select Footswitch, Drive Footswitch. The guitar effect pedal uses AC Adaptor power supply.