MXR® DYNA COMP® DELUXE COMPRESSOR M228 The Dyna Comp Deluxe Compressor delivers the classic sound of the original with a Clean control, Tone control, and an Attack switch tailor it to your specific rig and playing needs. This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included).