Countless guitar heroes have embraced the rotary-speaker sound on stage and in the studio. With this in mind, BOSS proudly announced the RT-20 Rotary Sound Processor. Employing COSM modeling technology, the RT-20 authentically reproduces classic rotary speaker sounds, and beyond. It offers adjustable Rise Time, Horn and Bass speed, and Overdrive -- and not just for classic twirl -- the RT-20 can be used to create unique overdrive and pulsating effects as well. This pedal also offers a stunning graphical view of the virtual rotors on its built-in display.