The Fulltone CT-1 Catalyst Guitar Pedal is equipped with a simple circuit that uses only discrete FET's to achieve its throaty roar. But the Catalyst stomp box brings something more to the table because it to does things that many other fuzz pedals can't. With its mini-toggle switch set to "Spark," the Catalyst effect pedal offers clean boosts, sweeter overdrives and all sorts of distortion sounds. Want more? Flip the switch to "Flame" and you'll be treated to a host of less civil overdrives, unique distortion voicings, and a plethora of vicious Fuzz sounds, all of which clean up with a twist of your guitar's volume knob, with a linear transition from clean to mean..