I have read that if you connect a DVD player, S-VHS player, TiVo, or any other device to your Pre/Pro with an S-Video cable then you must connect your Pre/Pro to your TV with an S-Video cable. Is this true?

What if I connect my DVD player with an S-Video cable and my VCR with a composite cable to my Pre/Pro and then use an S-Video cable from the Pre/Pro to the TV. Will this be a problem with the VCR? Will I get a picture when using the VCR?

I just want to make sure before I spend money on cables to connect everything.

Thanks!