Here's what Ampeg says about the Opto Comp Compressor:
The 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.
FEATURES:
Delivers smooth, vintage style compression
Dial in the perfect sound with Compression and Release controls
Output control allows you to maximize sustain and make up for heavy compression
True bypass, analog design with incredible signal-to-noise ratio
Roadworthy all-metal chassis construction
Powered by a 9V battery or 9V DC supply (not included)
