I know this might be a bit of a long shot but I've got an old 5.1 surround system that uses phono as front left/ front right, cent,sub, rear left/ rear right.
And now I'm upgrading most of my computers and Monitors to HD as I work as a Freelancer Sound, Camera, Editor.
I'm looking for a digital converter that would take one optical digital line and convert it to an analogue 5.1 phono or jack.