Pigtronix Rototron - Manual (Page 4)

2. Anatomy
2.1 Footswitches
Engage
This footswitch toggles the entire Rototron effect on and off. When
the engage light is turned off, the Rototron is bypassed.
Slow/Fast
This footswitch selects between the slow and fast speeds as set by
their respective knobs.
2.2 Knobs
Slow
This knob controls the rate of rotation in the Slow setting.
Fast
This knob controls the rate of rotation in the Fast setting.
Depth
This knob sets the overall intensity of the rotary speaker effect.
3