Starcaster Chorus Pedal "Level" control to dial in the perfect amount of volume boost when the pedal is activated. "Rate" control to adjust the chorus speed and swirl. "Depth" control to effect the intensity of the effect on your overall sound. "high filter" and "low filter" controls to dial in just the right amount of shimmer and syrupy goodness. Swirley... Shimmery... chimey 3-dimensional guitar tone!