I tryed that first, 16GB only put on 93 mp3's to start, when I hit AUX for it to play, I get a message "SYNC IN LINE". and nothing more, noplay. Perhaps one has to go through menu at that point to get it to play,however I did try to get sync to play a folder by saying, play folder "rock", and other variations like "play rock", my goal was to be able to say a folder name and have it play that folder from the start. When I just dump the mp3's on the flash drive it will play them, but if I want to hear lets say the 31st song I have to hit seek 31 times. thats no good. I will try using an artist name to see if I can get it to a folder.