I don't know if i'm missing something, but i'm unable to use the feature described in the reference manuel as follows:
Quote
Speed
Use the “Rate” parameter to switch between Slow and Fast rotation. You will notice that the change in rotation
speed is not immediate, thus recreating the acceleration and deceleration of the rotating speakers in
the original.
But how do i switch between Slow and Fast rotation to recreate the acceleration and deceleration of the rotating speakers 
There's no midi assignement to control that parameter with an expression pedal or a switch ?
Any suggestions,
