What I'd like to do is be able to switch to the AUX input and have the front panel buttons (or hijack IR translated values from my Pioneer remote) send serial commands through the serial port. One-way communication from the empeg is fine. No need for feedback.

So how would I accomplish this? Write a userland app that intercepts the button presses and dumps the appropriate data to the serial port (/dev/ttyS1) and change the internal mixer to take audio from the AUX jack? Could it be that simple? Looks like from this http://empegbbs.com/ubbthreads.php/topics/334459/Tuner_Interface thread I might be able to do everything I need through Hijack.

This is for a Bluetooth A2DP and AVRCP add-on module, by the by. I'd like to be able to stream Slacker or Pandora some times and this just seems like a pretty slick solution. Any thoughts, anybody?