API Select TranZformer CMP - Compressor Guitar PedalThe API Select TranZformer CMP incorporates API's legendary VCA type compressor circuit into a versatile and compact guitar effects pedal. Designed to easily fit into your pedal board and engineered to run off standard 9V power supplies, the CMP gives you classic studio quality compression right at your feet. Other features include a buffered bypass in out footswitch, adjustable attack and release times, wet dry blend control, selectable "feedback"