I am having problems with capturing audio from my vcr using that radio shack splitter, some times things will come out crystal clear and sometimes the audio comes with a buzz or hiss at high tones. If I just use mono out one plug without the splitter the audio is always crystal clear. How do I convert one channel (left) to 2 channels without buying a new vcr?

Capture Card: AverTV PVR
1.2Ghz athlon
sb live!
256MB ram