I recently got the DCT700 digital box, and have figured out how to record and watch VHS tapes with no problem. I generally record one show every weekday afternoon while I'm at work so I can watch it later. Lately, there have been some days where there is no sound at all on the tape for that day's show, although the video is fine and there is still sound both earlier and later on the tape. I'm wondering if it's just that the tape is old, although it does not seem to happen on the same spot on the tape every time. Or is there a chance that there's some other kind of interference happening? Any suggestions for a fix would be welcome!