I just noticed, dont know why i didnt think about that be4, kind of stupid, that my computer already has optical out, supporting ac3, dts, ect, through the headphone jacket...
Feels good to resolve the issue, feels worse to have bought something i already had, without knowing it. I should read the specifications on my stuff more careful...
Always costly to be stupid. The hiFace interface will go out on ebay to someone who needs it.
thanks for the answer though..