So I followed this tutorial for background music (or in my case ambiance) http://custom-zombies.com/Forums/index.php?topic=19.msg50#msg50  but I can't get it to work correctly, when I start the game I hear nothing, but then I restart the game and the sound plays but the sound alias provided doesn't seem to loop, developer 1 says something like "looping is not a known reverb_falloff_curve" and looking at it with the ugx sound alias editor I saw thats not where "looping" should be added so I corrected it but then didn't hear the sound in game at all

I tried the same thing and it didn't work for me. Here is a more detailed tutorial if you want to try it.
http://wiki.modsrepository.com/index.php?title=Call_of_Duty_5:_SP_-_Enviromental_Audio_System

ill upload my sound script later