Rotary Speaker Profile Specification defines a common set of basic features and MIDI messages to control a rotary speaker. The typical model is a rotating speaker cabinet with a horn and woofer that rotate at different speeds. The Device that implements the specification might be a rotating speaker or an effects unit that emulates the sound of a rotating speaker. The goal of the specification is to encourage implementation of a chosen set of MIDI messages for control for the parameters that are most common to all such Devices.