Rotor demo for organ and guitar
There are 5 basic controls: 'Whirl' (i.e., rotary speaker) or chorus, effect 'deep' or normal, effect 'flat' or normal, speed slow or fast, speed-shift instant or slow. In the chorus mode the speed and speed-shift controls don't do anything. The 'deep' control gives a thicker ensemble, (or more pronounced rotary effect), and the 'flat' control mixes in some unprocessed signal at the output. If 'deep' and 'flat' are engaged together, the logic on the board selects a further mode wherein some of the already-processed sound is mixed back to the input and passed through again, for an even thicker ensemble or rotary effect.