I can't hear my output of a guitar track through my apogee duet into Logic X all of a sudden. I can't for the life of me figure out what's wrong. I'm connected OUT from the Kemper L/R with XLR into IN 1/2 in the apogee for a stereo audio track in Logic. This has been working fine for a long time and now all of a sudden it is not. I need to INPUT MONITOR, right. Can anyone help me with what might be wrong in the setup. It's driving me crazy today....thanks in advance.