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You should be able to play music through just the headphone port to the aux port on the car stereo.
If you can't do that and your car has a tape player, feed it through with the tape to headphone jack set up - or buy an FM transmitter (thats what I use)
I think he wants to use the droid as the speaker for a seperate media player.
Wouldn't it work just the same... with the aux in? Has anybody tried this?
I'm pretty sure that it's not possible. The headphone jack only does output.