Only the yellow wire is AV.
Red and White is sound.
Since you're wanting to use Fiber TOS-Link to go from the Xbox to the Reciever, you just want to use the yellow wire to go from the Xbox to the VCR.
As the above post points out you can use it.
If you ever need to though, you could just buy a S-video to RCA adapter like this
Those adapters are cheap and easy to find. All Best Buys/Radio Shacks, etc should have them.

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