Multi mode enhanced compressor limiter is a dual channel unit in a steel chassis 6 inches (152mm) deep and one rack unit (44mm) high. With front panel switch to link the channels to track as a stereo pair, and switch to put the unit into dual band mono mode; in this mode channel 1 controls low frequencies and channel 2 controls high frequencies. The filter is 6 dB per octave, phase corrected, with a dividing frequency of 250 Hz, and the unit with summed filter response of ± 0.2dB through the crossover region. Each channel has 12 segment LED output level display and a 7 segment LED gain reduction display, plus variable controls for threshold, ratio and output gain. There will be a switch to toggle the compressor knee between hard and soft, with associated LEDs. A further 2 LEDs shall indicate Above or below threshold status. Attack and release times can be programmed dependent.