I'm asking because once you insert a CD magazine in the unit, it cycles through all 6 disk slots to see which ones are full or empty. Then, once the cycle is complete, it takes longer to start an MP3 CD than it does to play an Audio CD. If you haven't already, put an audio CD in slot 1 and see if that makes a difference.

One other thing to check for is a small switch just inside the door of the CD Changer. It should be in position 2 for "MBus". I'm not sure how they ship.

I have an '05 X5 w/NAV & DSP. I had the same changer and Soundgate adapter, but recently became a beta tester for the Intravee II mentioned above. The Intravee is an awesome device and only getting better, but no word on when it will be available for purchase.

Good luck.