@ Eye of Horus
This is all very nice, but even without testing (I don't have a 5.1-system), I can tell you, you won't get real 5.1 sound. I think, as theReal said, you're just applying some kind of surround effect, nothing special. I think it works in a similiar way like Dolby Surround Pro-Logic II.
But I will take the opportunity and ask you about something really impotant for me: how to generate high frequencies from a source that have frequencies up to 11KHz only in a good quality?
I remember someone having asked such a question but there was no good answer I think. You seem to be an expert in sound matters, so may be you can help