HELLO,I HAVE 03 GMC ENVOY XL. I WAS CURIOUS TO IF ANYONE NEW HOW TO SET THE REAR INDEPENDENT AUDIO. OK LET ME EXPLAIN THAT A LITTLE BETTER. HOW CAN THE KIDS IN THE BACK SEAT LOOK AND LISTEN TO A DVD MOVIE AND THE ADULTS IN THE FRONT SEAT LISTEN LOOK AT SAT.RADIO OR A CD. I'VE TRIED EVERYTHING UNDER THE SUN TO GET IT TO WORK BUT I CAN'T. PLEASE SOMEONE HELP ME....