Sweet, glad you liked it. I played a lot of fps growing up and one of my goals with this game is to use a bunch of map ideas I had made in Quake 3 and UT2004 in my own game.
Something's messed up with the audio attenuation. I'm planning another pass over it to use the map's PVS for occlusion, I should be able to figure out what's wrong with it there.
Did you try even with walking? Auto-run is on by default. That said, there's also still some collision glitches with low walls so you (and the enemies who use the same code) will sometimes just vault over things you shouldn't if you do it at the right spot.