distorted audio during video capture

posted this in the audio/video forum already, but I see this one has more traffic so maybe I'll have more luck with an answer.

I have a TV @nywhere Master for capturing and when I capture video from a VCR, the picture comes out fine, depending on my settings.. but the audio is always messed up. Not sure how to describe it.. but sort of twangy, or distorted or something.

I have an Abit NF7-S motherboard with nVidia SoundStorm which I am using for sound in my system. I have the capture card linked to the Line In on the motherboard. I've tried 2 diff. VCR's and have the same problem with both, when simply watching the original tapes, the sound is fine.

Is the nVidia onboard sound simply not good for recording? Or do I just have something set up wrong? Any ideas?