Pigtronix Dual Expression PedalPigtronix Dual Expression has two outputs, letting the musician control expression functions on two separate effects at the same time. There is currently no other expression pedal in the world that has this ability. In addition to the dual functionality of the Pigtronix EXP, the unit also has a polarity reversal switch to let you move the parameters of two separate effects in opposite directions. A good example would be increasing the speed of the EP2