Thank for the reply. No phone. No changer. I just want to play MP3 CDs by either 1) replacing the receiver with one capable of playing MP3 CDs, or 2) somehow feeding the "CD" input of the receiver with the output of a separate MP3 CD player. Also considering an FM modulator, but this is my least desired alternative.

If I understand correctly, option #1 is viable so long as I don't care for on/off with ignition, speed sensitive volume, and ilumination of the receiver face plate. I could probably live with these limitations. Are there any other issues to consider, such as the optic fiber wiring and amp, etc.?

Thanks.