Fipple
A part of a mouthpiece from an edge-blown aerophone. The fipple is a block or plug inside the mouthpiece below the opening that blocks the flow of air and directs it through a flue or duct (often called a windway) so it can pass over the sharp edge of the lip (often called a labium) causing the air column to split and vibrate to create a pitch.Instruments that employ the use of fipples include: duct flutes, whistle flutes, block flutes, and fipple-flutes.
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