X5 amp question
 

Here's my question and no one seems to know the answer. I've got the Dice DSP box accepting RCA left and right while sending out the signal via coax to the amp through the little plug-in on the top of the amp. Now which settings do I set my deck to recieve and play music if I have the big NAV screen/cassette player?

I'm really hoping someone has the answer to this. We've been fighting with it all day.