With the y cable, all music control is via iDrive. I guess, if I just used the headphone out to the audio in, I could control music via the iPhone but without the USB to dock connector there is no control or display via iDrive. Kind of defeats the purpose.
The only option is "random" music play. If they can do that, I'm sure they could implement other functions like shuffle or pause music but let other audio sources like TomTom play.
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