A hollow, funnel-shaped piece of wood or plastic that brass players use to alter the tone and volume of their instruments is called a: Mute.
What is a mute used for?
A mute is a device affixed to a musical instrument that alters the tone quality (timbre) or loudness of the instrument.
Mutes are often employed on string and brass instruments, particularly the trumpet and trombone, and are also used on woodwinds on occasion.
Depending on the type of mute employed, a mute modifies the sound of the brass instrument.
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