I have to admit - I can tolerate a much noisier class than a lot of my fellow teachers can. (I have 4 children and a constant houseful of friends). I have to really concentrate on keeping the noise level down.
We practice the Yadda Yadda scale ALOT. They love to pratice saying Yada Yada at whatever level I point to.
Pretty soon I can say "Class, If you can get your level to a 2 before I get to the scoreboard, you can earn a point. If you are not at a 2, I get a point."
If one person keeps the class from keeping their noise level, the Guff Counter works wonders.