I finally got all the pieces to my rig here, and I went to test it, but something's wrong. My set-up is JM27>UA-5>h120. I did the digimod on the UA-5 myself. I can see the red light coming out of the optical cable. Also, the peak light is lighting up, so I know the mics are fine. I just don't see any levels on the iRiver screen (it's Rockboxed). What could the problem be?