I am trying to record vcr tapes from my computer. I can get the video to record, but I can't get the sound to record. If I run the sound through my av receiver I can atleast haer it. I don't know if I need to change the format of my training tapes from .avi to .mpg first or if there is anything else that I should be doing. My vcr just won't get any sound. Please HELP!!!!