What happens to incoming toslink? If that's supposed to get converted into an RCA out, I'm not sure this is a simple switcher anymore.
Edit: Ah, I see someone else already brought this up. Anyways... and odd bit of gear.
Anyway, my previous comment about "pro audio" was more that this is the kind of thing that is much more commonly required in the pro audio world, if you want it, there's going to be something that addresses this already.