OK according to this my elementary and middle schools used Temporal. I know they were in groups of three with one or two "rests" between.

CCRI's new system is weird. It does three and then has a long conversation about how an emergency has been reported, walk don't run to the nearest exit, don't use elevators, etc.

Yes, I always have to look at this chart, it helps. CC new system is the worst, its voice vac and if that was not bad its notifier. to prove how bad voice vac is, Alalacis did a song over one. I hate voice vac it is very unsafe, anyone can just talk over it, and soon Federal is going to want voice vac to have 3 languages, CCs first system was a Simplex with 4051 horns and EBS TVs it was so loud