My wife and I each have I phones, and we can load both phones for taking and making calls. But we cannot figure out how to switch from one iPhone music to the other, using Bluetooth. We have tried everything, the C-Max seems only capable of handling one set of iPhone Music libraries. If we remove one of the iphones completely from the car, we can get either library, but doing that on a road trip is way to much work, and must be done while the car is stopped. Any help is appreciated.