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Why do tympani drums have pedals? (What do those pedals do?)

Why do tympani drums have pedals? (What do those pedals do?)

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Answer #1

The timpani pedal is attached to a mechanism under the drum that pulls and pushes a series of rods that are attached to the timpani counter hoop that sits on top of the edge of the timpani head. When the pedal toe is pushed down the rods pull the counter hoop down on the rim of the head and making the head tighter the pitch of the drum rises. Conversely by pushing the heal of the pedal down the rods are pushed up so that the counter hoop rises from the head’s rim thereby loosening the head and making the pitch go down.

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