This effect simulates the rotary speaker effect that is popular for organs.
34: Rotary Speaker
The effect is popular with organ type sounds.
The rotation speed continuously cycles
between the two speed settings at a rate
determined by the Acceleration parameter.
Dynamic modulation can be used to switch
from slow to fast speed. The rotor speed will
change at a rate speciﬁed by the Acceleration
parameter regardless of how rapidly you
move the dynamic modulation controller.
Vibrato Depth (Vibrato
Slow Speed (S)
Fast Speed (F)
For effect 34, dynamic modulation (16C) can be used to switch from slow to fast speed.
Speed S=25 F=70
Time taken to change from one speed to the other
Slow rotation speed
Fast rotation speed