The Boss RT-20 Rotary Ensemble encorporates the company's COSM modeling technology to emulate classic rotating speaker sounds heard on countless recordings. Part of the Boss Twin Pedal series, the left footswitch turns the RT-20 on and off, and the right footswitch toggles between slow and fast rotary speeds. The user can control the individual levels of dry and wet signals, and there is even onboard overdrive - which stylistically varies depending on which of the four rotary modes is being used. The RT-20 features "Standard" and "Enhanced" rotary sounds, as well as a Uni-Vibe modeler.

This pedal is in excellent condition with minor signs of general use.