Some language
The whooping sound you hear on the PA system is what the fire alarm sounded like when I was in primary school. From Pre-K to 3rd grade, every time the fire alarm rang, we would hear the tone on the PA. Instead of the AS or MT, we had Faradays that would buzz like the integrity. They disabled the tone on the PA in 4th grade when they couldn’t get it to sound right. I could not even begin to describe how wierd it sounded when we had our first drill in 4th grade.