Ampeg Opto Comp Analog Optical Compressor Pedal Ampeg Effects Pedal Refine Your ToneThe Ampeg Opto Comp analog optical compressor pedal utilizes an optical circuit to deliver smooth, vintage style compression to add headroom and sustain to your guitar or bass. Dial in a fast, subtle style to control peaks or crank up the compression to add a unique character. Bring your tone to new heights with the Opto Comp analog optical compressor.Delivers smooth, vintage style compressionDial in the perfect sound with Compression and Release controlsOutput control allows you to maximize sustain and make up for heavy compressionTrue bypass, analog design with incredible signal-to-noise ratioRoadworthy all-metal chassis constructionPowered by a 9V battery or 9V DC supply (not included)