Annoying sound effects in Crash Course Left 4 Dead

The sound happens when I enter some areas of the map. Mostly inside buildings. It's very loud. If I remove all the custom maps, it goes away. I've tried to add the custom maps one by one to find out which … more info

The sound happens when I enter some areas of the map. Mostly inside buildings. It's very loud. If I remove all the custom maps, it goes away. I've tried to add the custom maps one by one to find out which one is making it happen, but there's not just one doing it. Once I get to about six or seven custom maps loaded, it begins to return.   less info

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• Added 22 days ago