I was using an FM transmitter, which was ok, except for static and switching stations. I installed a USA Spec adapter which allows some control of the playback through my stock stereo. I am able to skip songs through the interface, but the playback is through the iphone's speakers, and not my stereo's. I am wondering if there is something wrong with my phone, but it seems like it should work ok, since it does with an FM transmitter. One thing that was annoying with the FM transmitter is that when the phone shifted, sometimes it would disconnect and reconnect and pop-up the incompatible device warning (loose connector?). I am thinking it could be 3 things: 1. USA Spec not compatible, but others and company says it is 2. Jailbreak 3. Dock connector has issues Does anyone have a similar past experience or suggestions? Thanks!