The WA76 Discrete Compressor is a high-quality compressor with limiting capabilities, featuring intuitive controls. - Model Name: WA76 Discrete Compressor - Function: Limiting Amplifier - Controls: Input, Output, Attack, Release, Ratio - Meter: VU Meter - Setting Range: Ratio: 4:1, 8:1, 12:1, 20:1 - Design: Black aluminum finish Thank you for looking. This is an outboard unit for sale. I purchased it used. I am selling it because I have decided not to use compression. It is in perfect working order, but there is a mark on the top, possibly from a pen. The input and output knobs occasionally produce a slight scratchiness when turned, but this does not affect recording.