INTERFACE2 DVS NO SOUND?????

SO JUST HOOKED UP MY INTERFACE2 TO MY 2 NO CDJ-900 AND DJM700 MIXER, INSTALLED ALL DRIVERS AND CABLES, EACH DECK TO LINE IN ON CH3 + CH4 OF MIXER, USB CABLES FROM ALL DEVICES TO PC, REKORDBOX SEES THEM, BUT I GET NO SOUND FROM MONITOR SPEAKERS, HEADPHONES OR VIA PC, I CANNOT WORK OUT WHATS GOING ON OR WHATS WRONG WITH IT ALL. INTERFACE2 IS SET TO LINE NOT PHONO AND I HAVE THE TIMECODE DISCS BURNT AND IN THE CDJS, BUT WHY NO SOUNDS??????