Bouncy Balls - Noise Meter for the Classroom

I stumbled across this website which has a whole heap of interactive and fun visual tools which would work well in the classroom.

I particularly liked Bouncy Balls, which works with your microphone - when there is no noise, the balls don't move, the more noise the higher the balls bounce. I thought this would be a great tool for behaviour management in the classroom. Used as a noise meter, students can visually see when they are getting too loud within activities and are then able to self-regulate.

I cannot wait to try this out next term! I just hope it doesn't have the opposite effect!
Give is a go at here.