定值衰减，衰减器，（打击乐大按键的）鼓垫的英文

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• 定值:    constant value; de ...
• 衰减:    attenuation; decay ...
• 衰减器:    attenuator; attenu ...
• 打击乐:    percussion music
• 大:    big; large
• 按键:    key; keying; press ...
• 的:    4次方是 The fourth po ...
• 鼓:    drum
• 垫:    put sth. under sth ...