Hi, I'm having some kind of audio trouble -- there's a bzzz sound in everything I edit. I don't always hear it until somebody points it out, actually. But sometimes I do hear it -- big and bad.

The original audio does not appear have this bzzzz.

I am going through a trial and error process to determine the issue. I have used various machines to both tape and capture the video, so I'm not sure if it's the source. (Although some -- but not all -- of my tapes had a great deal of "video noise"). One of the only common links is that I edited the bzzzzz stuff in Vegas. I did some projects in Avid and they were clean.

What's going on?