I've heard of people putting cotton balls in their toms to muffle the sustain. When you hit the drum, the movement of the resonant head will kick up the cotton ball, and when it falls back down, it will muffle the head, shortening the sustain length without impacting the EQ of an "open" tom sound. I've never tried it myself, but I've heard that it works great. I assume that glitter in a tom might do something similar. Now I'm curious about this, too. Anyone?