I've set my sound to quad speaker in the demo, and ive gotten some pretty good 3D sound. Perhaps this is because I use a stereo attachment to my computer - no 4 piece multimedia speaker set - its a $650 Stereo system that is designed to produce 3D sound, but i would think that it would work the same on any speaker set? Maybe im wrong..
Either way, ill just use this time for some shameless self audio premotion, to cover up my crappy computer specs
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~Blaze