Audio 8DJ mic won't work in Cross DJ

Hi all I've recently acquired a NI Audio 8 DJ sound card which I've been using with Cross DJ and U-Mix Control Pro. Got the drivers all installed and I am able to play and monitor no problem. The problem arises when I try and use the mic. I can use the Mic using Traktor Scratch Pro but cannot find a way in Cross DJ of outputting the mic back through sound card to come out of the speakers. I much prefer Cross (2.5) to Traktor . The mic is plugged in the Audio 8 as is the headphones and RCA's to amp. The problem appears to be that either Cross doesn't offer a thro setting withing the audio setup or else I am just too stupid. please help. Thanks Jim