Dance Mat was my first interactive sound installation and done in a week. It was an interactive sound/dancing area with buttons on the ground that could be stepped on. The dance floor was later covered with a Twister mat from the Twister game.
There were three different kind of sounds in the of button rows. Loops that you could switch on/off and individual short and long sounds. Each color had a led light that indicated which buttons were on.
The sounds were played surround format. The coding was done with Arduino and Pure Data.