4 channel compressor/Limiter with variable trigger control and switchable Fast/Slow Release, 5-segment LED meters for Input/Output levels, gain Reduction on each channel. Advanced circuit design utilizing low noise operational amplifiers and high-quality VCAs, servo balanced Inputs and Outputs on XLR and 1/4" connectors. SKD (Smart Knee Detector) circuit automatically switches from soft to hard knee based on the level of Input signal applied, individual Threshold and Ratio controls on each channel