HALO with DOlby Digital surround

I finally played Dolby digital surround sound when I was playing HALO online last night. I had no freaking clue your heart beat so loud and hard when you were down to one bar oh health, damn its gets annoying after a while. And it doesnt relaly help when you are playing mulitplayer with more than one person on the mox with you. You can hear footsteps but you dont know if they are behind you or the other people on the screen. I noticed a lot more things and it is pretty cool, but that haertbeat thing is just too freaking annoying, I couldnt figure out where it was coming from at first! EVERYONE CHECK IT OUT!!! BE ONLINE TONITE AND GET BEAT!!!