I'm looking at getting a new 5.1 all-in-one system (not sure about with or without Blu-ray at the moment). I only have one HDMI input on my TV, so I am looking at ones with 3 HDMI inputs so I can use the all-in-one to switch between my sources (Sky HD, Xbox 360, Popcorn Hour). Sounds straightforward, but as we know the Sky boxes will not output 5.1 over HDMI, only optical. I have looked through some of the manuals for all-in-one systems and I can't see a way to switch to the Sky HDMI input but have the sound coming from the optical input. Does anyone know of any all-in-ones that can do this, or do they all do it and I am just being stupid?