This might sound weird but here is what I want to do:

I have an Alpine headunit that reads USB devices. Basically when I hook up the iPhone it goes into iPod mod and plays what's on the iPod. Now is there a way to get any sound thats playing through that input to play instead of what's on the iPod? Like override it so that it automatically plays what's currently playing on it through the USB input? Basically I want to do this so I can listen to Pandora while having it hooked up to the Alpine. Any idea if this is possible?