The Rover runs circles around other rotating speakers. You don't have to settle for just two speeds. You can spin your sound at any speed You can even pre-set the specific speed you want. Then just floor the footpedal when you want it. And the Rover doesn't limit the spinning sound just to the organ. Its new "rounder" sound makes almost any instrument sound great. . . organ, guitar, horns . . . even vocals. The Rover is louder and clearer because of its own powerful built-in amplifier. And for large concert hall sounds you can connect several Rovers together. . . and control them with just one pedal.