4 CHANNEL COMPRESSOR/LIMITER, EXPANDER/GATE WITH ENHANCER, LINKABLE IN TWO STEREO PAIRS, EXPANDER/GATE WITH VARIABLE TRIGGER CONTROL AND SWITCHABLE FAST/SLOW RELEASE, 5 SEGMENT LED METERS FOR INPUT/OUTPUT LEVELS AND GAIN REDUCTION ON EACH CHANNEL, ADVANCED CIRCUIT DESIGN UTILIZING LOW NOISE OPERATIONAL, AMPLIFIERS AND HIGH QUALITY VCA'S, 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