yeah well you use a env_sound and select the setting that you want. That setting will stay with you until you hit another one. To turn it off make the player walk past a "normal" one. I have a good map where you just walk through these rooms (theres one path) and you run into all these env_sounds with the setting that is on each one written on the wall, its good if you are trying to find a good one. But its somewhere on my laptop.