Samson S-com 4 4-Channel Compressor/Gate 4 Channel Compressor/Limiter, Expander/Gate with Enhancer, Linkable in two Stereo pairs Expander/Gate with variable Trigger control and switchable Fast/Slow Release 5 Segment LED meters for Input/output levels and Gain Reduction on each channel Advanced circuit design utilizing Low Noise Operational Amplifiers and High Quality VCA's Servo Balanced Inputs and Outputs on XLR and 1/4" connectors, SKD (Smart Knee Detector)