I was never able to get the SWI-X to be able to control both the Empeg and Sony HU, but I'll give that another run when I can, and I'll update with the results.

What method were you trying to use to do that?

Hopefully not by trying to get it to learn both devices at the same time. It can only learn one IR command per button press, if you try to make it learn both, it'll just look like interference noise to it.

Theoretically, you could make it work by having it learn the Sony commands, then using Hijack and IR-translate to show you what the Sony button codes are, and programming those into Hijack.