Hi, I know that the RD4 radio CD player has a Mp3 capability that has to be switched on by the dealer and will involve having a socket fitted. If the radio has the Mp3 switched on will the CD player recognise a CD containing MP3 files? Is there a charge for switching on? and has anyone used the FM transmitters that you can plug into the cigarette lighter socket and your Mp3 Player? thanking you in advance Tony C.