Shame You call it a kazoo.
It's a "fanfare", a sound warning indicating the going of the hunt, from the peep of the day to the retour of the hounds to the kennel.

sound warnings for every circumstances of the hunt

including the "fall off a horse "la culbute en foret"
Created when no one had a cell phone.
You'd better know all of them before taking part of it.

tradition my friend, just as in Your country.