I work at a LAN center, and we recently got an In The Groove arcade machine. (Pic) It's great, but the only problem is that there is a basement underneath us, and the building is fairly old. When people play on it, the vibrations from them stomping on the pads shakes everything in about an 8' radius. This is causing some of the PCs to be nearly unplayable. What would be a cheap and effective way to stop the vibrations, if any? Also, if we were to put something under the pads to stop vibrations, it'd be best if it were under ~6" high.