Once fitted to the drum by attaching it to the rim, you can adjust the amount of dampening by either moving the Dampener from the center to the edge of the drum head, or by sliding the O ring up or down. Genius!
The system was designed in conjunction with drumming heavyweight Dave Weckl.
The Remo Active Snare Dampening System is available for about $30, and should be part of every drummer, studio or engineer's arsenal. Here's a quick video that gives you a bit of an idea of what it will do (it's not all that dramatic, unfortunately).
