I thought it worked where if there was a card in the CF slot with files on it, it would be added to the button's list,and if something was added to the Aux port, it would then also show.

MB and CD didnt get added to my Source button list until something was there for it to play.
Take all CDs out, CD is no longer accessed by the source button.
MB was added once I ripped my first CD to it, which BTW, only takes 10 minutes if listening to a different music source...

 

where in the manual does it say that you can use the steering controls to scroll to AUX? I just double checked and my manual doesn't say anything about AUX. It's too bad, since I never use the CD player, musicbox or CF card.

Oh wait, i just re-read one of the original posts, the quickstart guide says that. I didn't look at that. I actually pulled out the big dictionary manual and it doesn't say anything about AUX. Guess the two guides don't agree with each other.