The unit contains two separate compressors, with the upper one normally controlling the left, centre, right and surround channels and the lower one the LFE channel. The "dual stereo" switch reassigns the controls so that the lower set control the surround channels and the upper set control left, centre, right and LFE channels. The "side chain trim controls" allow different thresholds to be set for left/right, centre, surround and LFE channels. The centre and surround ISO switches bypass the respective compressor channels completely. A six-channel master fader and "autofade" control provide overall level control of the mix.
