I have a Toyota Prius with Bluetooth. I often use the Bluetooth player to listen to an Audible book on my DroidX, and sometimes use it for Pandora. I rarely use the default music player on the phone, and almost never on the car Bluetooth. However, each time I start Bluetooth, I never know what might start playing. Sometimes it will pick up with the Audible book, but often will start with the default music box. Sometimes it starts with Pandora. I've looked at the settings and I don't see any way of preventing the music box from starting automatically. Any ideas?