Thanks, Mark!

FM MPX output - ugh! That's a huge wrench in my project concepts! So, I guess the DSP is doing the demultiplexing of the FM data. That kinda rules out HD radio unless I hack the DSP code to do the ODFM demodulation... that'd be a LOT of work.

Ok, moving on to the AUX input port

Mark - can you point me to a place in the source to start looking for controlling the serial port and UI when the player is in AUX mode? In this instance, I'd prefer to keep my regular tuner working as is and just use the AUX port and the other serial port to control extra hardware. Getting an iPod/iPhone to spit out track information is really easy, if I can get the empeg to send serial commands to it.