Rotary Speaker
The rotating speaker effect uses the doppler effect to create a unique fluid-like sound. As either the source or listener of a sound moves round one another, the frequency and wavelength and continually changing which creates this sound. They were first introduced as huge units on organs but are now simply simulated in processors.
Parameters:
Cross Over- It can also be used as a balance between different types of rotors inside the unit (Horn, Bass etc) to create different sounds.
Speed - This controls the oscillation speed of the effect.
Rise Time/Acceleration - This sets the amount of time that the rotor and horn take to come up to their full rotating speed.
Direct - The rotary speaker units will always have a balance for controlling the amount of the effect to the dry signal.
Spread - In some units, the stereo microphone positions can be altered around the simulated cabinet.