Yamaha GC2020B Compressor/Limiter

from the Yamaha Blackboxes website: The Yamaha GC2020 is a high-performance 2-channel compressor/limiter that can be effectively used in recording, sound reinforcement, and other production applications. The GC2020 offers a wide variety of control features for precise tailoring of compression and limiting parameters, and it also features an expander type noise gate in each channel for effective noise reduction.

• A full 20Hz-to-20kHz frequency response with no more than 0.03% THD at maximum output.
• Switch selectable dual-mono and stereo modes.
• Comp In/Out switches on both channels; activates or bypasses compression/limiter circuitry; LED indicates status.
• Expander Gate with a variable threshold level on each channel eliminates background hiss and noise during no-signal portions of a program.
• A 5-segment LED meter on each channel indicates how much compression or limiting is being applied.
• Separate adjustments on each channel provide precise threshold control
• Variable compression controls on each channel provide precise tailoring of compression ratio.
• Variable attack and release-time adjustments on each channel provide natural sound with a wide variety of signals.
• Input and Output level controls on each channel give broad compatibility with professional equipment.
• Input and Output connections utilize both standard 1/4" phone jacks and XLR balanced connectors.

note - the unit worked fine the last time I used it but that was 30 years ago and I have no way to test it. I have lowered the price and the unit is sold as is.