No problem. I usually use this test to scare the crap out of people who still says virtual surround has no accuracy at all.
Anyways, I too couldn't tell the difference between 5.1 and standard 2.0
Also, setting 5.1 on both my SBZ and my older XFi XtremeMusic worked with the binaureal effect that the clip has.
I do know that Creative drivers used to be quite screwy with the way it handles virtual surround... so I'm not really sure at this point for those who can't get SBX working in 5.1.