I just received the following email from an empeg user:

"After some tweaking with MAD (no audio heard, originally), and a little hacking of the KeyCodes (different button and remote IR codes), I now have a semi-working rioplay on my empeg."

Pretty cool! Looks like I'll have to clean up the display code now so that it'll be easier to modify for the 128x32 screen of the car player...