The XR4400 gives you four frequency-selective UTR expanders/noise gates in a single rack space without compromising on functionality. The side chains parametric filters allow you to fine-tune control signals so that the gate reacts only when you want it to. Separate hold and release controls and our unique FlexLink system offer additional flexibility. FEATURES:[ Four separate expander/gate circuits [ IRC expander/UTR gate circuitries [ Extremely short attack time (<10 µsec.) [ Parametric side chain filter with monitor function [ Independent hold and release controls for flexible envelope shaping [ Maximum attenuation 80 dB [ FlexLink system for flexible master/slave configurations [ Traffic light display for threshold working point and gain reduction display