A.By connecting an optional expression pedal (e.g., the Roland EV-5) to the SPEED (EXP PEDAL) jack on the rear panel of the RT-20, you'll be able to control the rotary speed in realtime by adjusting the foot pedal’s position.

The rotary speed will change from the SLOW SPEED knob’s value when you raise the pedal to the FAST SPEED knob’s value when you press the pedal down.
(2005/10/14)