It depends on if you're using their preloaded songs. I erased theirs and put my own discs on mine.
I have a Cavs JB199 and have had no problems with sinc issues on it. Of course I am using my own songs.
On my Cavs DVD 203G USB I sort of have the opposite problem. My graphics change color a little behind the music on some songs, not all. It is very slight, but I notice it. I hook a external drive to the 203G and haven't figured out why the delay.
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