I called Montvale to see if there were any plans to update the software to support MP3s with the VCS. The first person suggested that I try "CD Player". I gave it a try and it still says "there is no disk". I called back, and the second person connected me with a technician. After going over the fact that the disk can be played via the controls on the head unit, the technician did some investigating. His final answer was it should work. As long as there is a CD in the drive, music CD or MP3, it should play the next track. He then suggested that I contact the dealer and have them get the MB Tech center involved. I talked to the service advisor to tell him about my conversation with Montvale. I will have to make an appointment with the dealer to leave the car with them for a day. (He sounded like he thought he made this go away) I hope that at the end of all of this they don’t come back with the “only store bought CDs” answer again.