The Neo Instruments Ventilator II is capable of faithfully emulating the sound of the legendary Leslie Model 122 Rotary Speaker. After the original Ventilator effect and the two miniVents, the success story of these popular devices now continues! The original Ventilator has proven itself as a companion to international stars including Chuck Leavell (Rolling Stones), Craig Frost (Bob Seger), Steve Miller and John Mayer. The Ventilator II sits in a sturdy metal case that's handy size making it easy to place on top of a keyboard rig or guitar pedalboard. It has three knobs for adjusting the rotor speed, balance and Drive . In addition, there are further controls for virtual microphone placement. This allows you to simulate different microphone distances to the drivers. Bypass, speed and stop can be controlled via the three footswitches. Starting with serial number E2309280, the Ventilator II runs on 9V DC (- inside) which is also the standard for guitar effects. The enclosed rubber feet can be attached if necessary.