Behringer Composer Pro-XL MDX2600 Reference-Class 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 Integrated De-esser with switchable male/female voice recognition removes excessive sibilance from your vocal tracks IGC (Interactive Gain Control) peak limiting circuitry combines clipper and program limiter for reliable and inaudible protection against signal peaks Switchable dynamic Enhancer for brilliant, lively audio even with heavy compression IRC (Interactive Ratio Control) expander/gate circuitry for virtually inaudible noise suppression