The Roland EV-30 is the best choice for an expression pedal. Its compact size makes it ideal for crowded pedalboards, and its aluminum chassis offers the sturdiness and durability characteristic of Boss. A key feature of the EV-30 is an innovative internal mechanism that provides a smooth feel and precise parameter control. With two expression outputs, you can save space by controlling two different devices from the same pedal. The outputs are electronically isolated, eliminating the possibility of noise problems. A polarity switch allows you to use it with different types of devices.