Everytime I connect my iphone 4s to my 930bt via the iphone/ipod cable to play pandora, the audio seems off. The music (guitar, bass, drums) is at a very high level, and the vocals are very muted. You can barely hear the lyrics from the vocals?? It cant be my phone, because it does it with every iphone. I recently did the firmware upgrade hoping that would fix it, but no such luck. Any suggestions or has anyone had this issue? thanks!