I was thinking of getting those all in one video/audio upconvertor and switchers from Radioshack. Do they cause more interference than good. The ones that convert composite to s-video and LR audio to TOSLink, and switch components. I wanted to hook up my VCR and laserdisc via s-video. My laserdisc player has a good s-video output, but I can only connect the VCR or laserdisc at one time so would this switch do me well?