I use simple and cheap silicone plugs available at any drug store. They cover the ear opening and you can adjust the dampening level by how tightly you pack them. As I come up to octave 7 I'll usually loosen them some to allow the higher frequencies. They work great. Dean Dean May cell 812.239.3359 PianoRebuilders.com 812.235.5272 Terre Haute IN 47802
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