Behring MDX4400 Gate/Expander

It has some scratch marks but works flawlessly.

Interactive Reference-Class 4-Channel Compressor/Limiter/Peak LimiterProduct Features

• IKA (Interactive Knee Adaptation) compressor concept combines the advantages of "hard knee" and "soft knee" characteristics
• Switchable high-pass filter in control signal path avoids low-frequency signals from dominating compressor action
• Compression characteristics switchable between IKA and "hard knee" characteristics
• IGC (Interactive Gain Control) peak limiter combines clipper with program limiter circuits
• Extremely low-noise operational amplifiers and high-grade VCAs
• High-quality detented potentiometers and backlit switches
• Stereo Couple function for channels 1/2 and 3/4 selectable with real sum of RMS output
• Accurate 8-segment LED meters for input level, output level and gain reduction
• Operating level switchable from +4 dBu to -10 dBV
• Servo-balanced inputs and outputs featuring 1/4" jacks and XLR connectors
• High-quality components and exceptionally rugged construction ensure long life
• 1 U rack mont