OpenAl is simulating a 3d space where the sources are located within. So when playing something to the right of the listener it is also heard to the left of the listener (although somewhat softer and maybe a bit later) (remember that when lightning strikes the sound comes later).

I have another question. I added an eax effect. But i cannot hear it. I blame it on the realtek soundcard inside my laptop. Can someone here try the latest source?

http://www.noeska.net/downloads/oggstream.zip .