> The Shark can comfortably do this with a fixed-point based player;
> someone for the Acorn RiscOS machines wrote such a thing.

Although it's theoretically not hard, I've not yet seen such code.

> I think, too,
> with FP you'll be pushing it. We can get a factor of 2x on the current
> l;ibrary, but that's about it I think.

I believe a factor of 2x would actually be sufficient, provided the
machine is otherwise idle.