Or, at least I think so. I confirmed that COAX works the other day. It requires a standard 1/8 " to RCA adapter, but it worked like a charm. Oh to hear Spider Man battle the Green Goblin in DTS surround!
As for toslink, I don't have a cable laying around, or I would have tried that too. But since there is a nice red glow coming out of the S/PDIF jack, I'm betting that works too. I do need to try it though.