Been trying to use AUX 3.5mm cable in standard stock system in car to plug and play music (pandora, napster, etc...) through my vibrant, however the music comes through only the left side of the speakers in the car. 3.5mm plugs into the headphone jack (all the way in) of the vibrant into the AUX jack in the car. Talked to a T-Mo sales associate in store, said she had the same problem, talked to another, said she had no problem. Any thing I'm doing wrong here? Any help or advice is much appreciated! Thanks!