Audio dynamics processors for professional sound management in studios and live performances. Quad channel compressor/limiter with mono or dual stereo operation modes for versatile configuration. Features Smart Knee Control delivering soft knee compression at lower thresholds and hard knee function for heavier compression. Smart Gain Control peak limiter activates above user-adjustable threshold to restrict signal peaks. Automatic attack and release times based on input signal analysis for musical, inaudible compression. LED meters on each channel displaying gain reduction and input/output levels. Individual bypass switches on all channels with couple switch for stereo mode operation where master channels override slave controls.