Damn i cant see your names here cuz the thread is too long, but to the guy that couldnt find Promedia 5.1s: yeah they're pretty impossible to find. They dont even have them in the klipsch online store. i was lucky to pick some up at my local retailer in brazil.
To the other dude:
I had the same problem when i first installed my sblive xgamer last year... my solution was real simple: in advanced recording options the mic was muted. pretty dumb huh?
this might be it, though since the rest of the card works good.
let me know if this helps!
