When you strike the drum it’ll create a wave of sound inside the drum. Normally this wave starts bouncing around inside the drum, back and forth, giving a sort of lasting ringing a few moments after you hit it. That’s not usually want people want, they want the sharp WUMP of the drum, and then silence.
So the pillow as an a “damper”. To damp something is science-speak for “reducing the intensity” of something. In this case, it’s reducing the intensity of the wave so that it dies quicker.
Not to be confused to *dampen* something, which means to make something slightly wet.
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