Behringer  MDX1600 2-Channel Expander/Gate/Compressor/ Peak Limiter Switchable IKA (Interactive Knee Adaptation) program-adaptive compression circuitry combines the advantages of hard-knee and soft-knee characteristics Adjustable dynamic enhancer with level meter for brilliant, lively audio even with heavy compression IGC (Interactive Gain Control) peak limiting circuitry combines clipper and program limiter for reliable and inaudible protection against signal peaks Switchable de-esser removes excessive sibilance from your vocal tracks Ultra low-noise 4580 operational amplifiers and state-of-the-art VCA's