I don't know if this will help or not, check out this thread
http://www.xoutpost.com/bsws-mobile-e...d-changer.html
Also, I have ordered an iPod adapter to try out in my set up, once I install it, I will update the write up with more details, some additional pictures and some block diagrams, to make it easier to follow. I anticipate the updated version of the write-up sometime within next couple of weeks - the mail takes too long from the States to the APO...