Alright first off, the cd player doesnt work. So i ordered a usb to aux adapter, and it didnt work. So i got a usb drive and plugged it in, now there is only bass, nothing comed through the speakers what so ever. If i change it to tuner, it plays radio stations fine, but when i switch to usb it poops. Theres also a auxiliary source on my head unit. Im guessing its for the ipod adapter. But would it work with a iphone? It says its compatible with the fourth gen ipods, and im using a iphone 4?