The heart of the MixPad is Samson's MDR(Maximum Dynamic Range)Mic Preamps which provide which provide wide frequency range, definitive channel seperation, and natural response. The 144 FX offers 100 24 bit studio quality digital effects and bidirectional USB connectivity for recording your performance or integrating files from your computer. Four mono channels have single knob compressors for studio quality dynmaics control. Pre Fader Aux send for monitor mix, post fader aux send for external effects. Bright colored knobs and 8 segment LED level metering ideal for dark stagesFeatures:6 low-noise high headroom MDR Mic preampsPrecision 60 mm Faders100 24 bit Digital Effects built inHigh-integrity Bi-directional USB4 studio quality single knob compressorsStereo channels with multiple input options(1/4" and RCA"XLR main outputsAll Mic channels have gain knobs & HPF switches48 Volt Phantom power8 Segment LED level MeteringRugged roadworthy design