Cusack Music Tap-A-Whirl

The Cusack Music Tap-A-Whirl is a tremolo pedal. You can see the Tap-A-Whirl in the picture which I included on the left. This is a photo of one of Brad's pedalboards when he was still with Third Day. You can have a better look at this pedalboard here. The Tap-A-Whirl is the pedal on the far right, bottom row.

You can have a closer look at this pedal here. On this image you can clearly see all of the pedal's knobs and controls.