I have a G4/400 and have had some problems with the audio plaback on some DVDs. I've found that on most DVDs the sound becomes more and more out of sych the longer the DVD plays. Most times the problem can be solved by simply pausing for a few moments and resuming, but i have recently had a string of DVDs that just woudn't sync at all. Is there any way i can help solve this. And what is "line mode" anyway?