The factory high line system will take an AUX input OR a CD changer at the same connection.
You don't mention which MP3 player you have, if its an IPOD, then grom audio do an interface that will retain the steering controls, charge the IPOD and also control it from the headunit.
GROM USB and iPod integration homepage
PS it will NOT list the Discovery on there website and it refers to the Rover 75 and BMW stuff, NOTE the Disco 2 uses ALL BMW wiring etc and the interface will work.


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