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Your issue is caused by impedance. It is basically the static noise that you are receiving. The reason for the sound is do to not enough power in the aux input. I have brought this up to BMW a couple times, and they do not have a solution. However, there is a way to fix the problem. If you buy a portable amplifier ($50-150) it will solve the power issue which is causing the noise. Audio device to amp and amp to aux port in car. It will give enough power to play your music. Companies like Fiio works really well.
The other solution is a usb stick (not all are compatible). I found the best results is to get a microsd card, and a reader which has a standard usb port attached to it. Aux will only give you 2.1 audio which is all it is rated for however, music through usb will let you use the full potential of your stereo system; resulting in "cd quality music" 128kbps and up.
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