OK, I have a 2004 escalade with the LCD Nav unit, and the flip down roof dvd setup in the rear. What exactly CAN I DO while people in the rear are watching dvds???? I am about to take a 10 hour road trip to myrtle beach and I know the people in the back seats are going to want to watch movies. I want to be able to listen to music up front. I have been trying to toy around with it, possibly have the people in the rear use the headphone jacks while I listen to XM or CD's, but it's not cooperating with me. Does anybody have any advice????? Thanks in advance.