There are other threads about this subject. It seems a pain in the *** to get decent sound from any dvd/mp3 player into the AV slot. Sometimes the screen keeps on displaying 'mute' all the time and no sound is heard. I have experimented with this AV slot couple of weeks ago (along with a direct cable into the OEM TV module in the trunk), and was not able to get sound into the system, so I gave up ...