Four-channel dynamics processor in a compact single-rack unit. Each channel combines an Expander/Gate with a Compressor/Limiter and can operate independently or as two stereo pairs. A variable Trigger control, fast/slow release, and per-channel Threshold and Ratio provide flexible dynamics control. The Enhancer restores high frequencies attenuated by compression. The SKD knee detector selects soft or hard knee based on input level. Five-segment LED meters display input, output and gain reduction; inputs and outputs are servo-balanced XLR and 1/4" connectors.