Is there a way I can change the amount of zombies that spawn per round? My map is pretty small and I would like the classic amount of zombies per round from World at War.

So, I have a door sound that I would like to be played when a player opens a door in my map. The problem is that I can't seem to figure out how to get it to play. I have set up the sound alias and the file is set up as a wav at 48000 Hz, and I've tried using all the sound script_structs in radiant and attaching it to the trigger for the door, but it doesn't play when I open up the door. Anyone know how to do this?

The problem I'm having is that zombies will only spawn in the zone I'm currently in even if all other zones are open. For example, if I'm standing in zone 2, only zombies will spawn in zone 2, and they won't spawn in the start zone or any other zone.

Is there a way to change the sounds that the zombies make? Are there sound aliases that are used for these sounds?