okay, this is really weird!!
I'll post the couple of things that came to mind when I was reading this, but upon finishing reading I'm not so sure if they'll help.
-check your soundcard settings. sometimes there's a "3-d" option or something of the sort in the advanced options, turn make sure that's off.
-perhaps one of your speakers is wired out of phase? try reversing the red and black wires of either the left or right speaker if possible.
-try another soundcard, you can get the bottom of the line soundblaster for $20 here, small price to pay for the information you might get from the experience.
-as you mentioned, try this:
http://www.jfitz.com/software/RAMpage/
hope this helps
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