Hello. I've tried searching through the forums and internet for this answer, but so far no luck finding one. I am looking at getting a 2010 Prius IV (SR package). I have an iPhone 4. Can anyone shed some light on how the current USB connections work for the iPhone? Specifically I'd like to know if its still possible to control the music directly on the iPhone when its plugged in or does the head unit take over complete control? (The former is preferable to me). Thanks.