CDDIG
Well that stinks that it will degrade the sound quality. I did read on either a different HU or an ipod connector that the device will boost the signal and "clean up the music" to make it sound even better then it did to start with. I need to remember where I read that and find what decive that was. I'm pretty sure it was some sort of adapter.
In any event the sound thru the aux port should be MUCH better then thru the Itrip...