BEHRINGER EURORACK UB1222FX-PRO Ultra-low noise design, highest possible headroom, ultra-transparent audio 4 state-of-the-art, studio-grade IMP "Invisible" Mic Preamps with 130 dB dynamic range for 24-bit, 192 kHz sampling rate inputs Revolutionary FBQ feedback detection system instantly reveals critical frequencies Studio-grade stereo FX processor with 100 awesome presets including reverb, chorus, flanger, delay, pitch shifter and various multi-effects Voice canceller function on dedicated 2-track return channel for easy-to-use sing-along applications