None of the others seemed to have my issue, though. I've got a custom looping alarm .wav file that I'd like to play when a player comes into proximity of the ambient_generic. While messing with settings, I got it to work successfully, but it was very quiet. I increased the volume on the file and now I cannot get this looping sound to stop playing, no matter where you are in the map. I first solved the problem by using a mono sound file instead of stereo, but now it seems that no manner of mono, stereo, or combination of flag checks on the entity itself will allow this thing to work the way I know it should. Will someone please tell me precisely the proper method for using a custom wav on a proximity-based sound entity?