Here are the facts about the Lightning - 30 pin adapter.
The things that the dock connector adapters let you do:
Analog audio output to stereos, docks and anything else that uses a 30-pin cable of any sort to send audio.
USB audio output. If you’ve got a car stereo that takes a digital input over a wired-in USB cable, you’re still fine with this adapter.
Syncing and charging, of course.
The things that they do not let you do:
Utilize iPod Out, a relatively little used feature that allows transference of the iPod or iPhone’s music controls to an external screen or buttons,