Just bought the CD-1200 adapter from Best Buy. I turned on the Aux. input from the intial setup screen but it would not work. If I decide to go with the RCA-headphone jack does it go into the A/V input on the brain? Thanks in advance.

You can use the A/V input as an audio jack, if you wish; or use the CD-IB100II for a somewhat decent control and audio interface. It's not real speedy, but it gives you some control from the N2's touch screen.