Si Expression 1 16Ch Digital Live Sound Mixer (Inc 19" RMK)Drawing on more than a decade of experience in the field of digital audio mixing, the Soundcraft Si Expression exploits some of the newest DSP, component technology and manufacturing techniques to deliver our most powerful cost effective digital console ever! Each console in the range is identical in its feature set so your only choice is how many faders and local mic amps you want. With a range covering the super portable 19" rack mount Expression 1