Retro-Sonic Compressor

You can see the Retro-Sonic Compressor 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 Retro-Sonic Compressor is the second pedal from the left, bottom row.

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