Since timpani have a long sustain, "muffling" or "dampening" is an inherent part of playing. This provision prevents the modification of muffling devices that increase the emitted sound. He devised a method of muffling the engine's extreme noise with a wooden box. The producer solved this by muffling the buzzing with the ocean overdub. Drum muffling pads may be used to lessen the volume of drums during practicing. Ricoh claims that underwater sounds can be captured without muffling. Scott Crago and Jeff Obermeyer invented a drum muffling device (U.S. Patent # 5,088,376). Muffling can be installed through the hole without taking off the front head. Additional techniques such as muffling may also be used.