I have an iRiver 40G MP3 player and hook it up to the CRD with a
Belkin TuneCast II.
Just set the radio to an unused frequency, and set the TuneCast to broadcast to the same frequency.
The volume controls on the steering wheel work, because its using the radio. (It doesn't actually change the voume coming from the MP3player -- it's changing the receiver volume. I find it works best if the MP3 volume output is boosted toward the loud end, then it can always be turned down at the radio.)
You would still have to twiddle with the MP3 player itself to switch to different songs.
_________________
Thanks,
Ken Jennings
2006 KJ Limited 4x4 CRD, Option Pkg G, Lt. Khaki, Built 1 Feb 2006
Tow Package for myself, EVIC TPM
Side Curtain Airbags for my daughter
http://www.kenjennings.cc/crd/dieselexp.html