The JVC DVHS units all have TBCs, right? I believe that they have the horiz-sync type not the vertical or frame-alignment type. But can you play an analog VHS tape in one, then record the digital MPEG2 stream out the firewire port? If so, wouldn't this solve both issues with old tapes -- poor line-sync and lost frames (audio sync)? I was all set to buy a used JVC 30k but then the owner said that the firewire port was inactive during VHS playback.