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In page Flue pipe:
"Between the foot and the resonator, the side of the pipe containing the mouth is flat. A plate of metal or wood called a languid, fixed horizontally here, blocks the airway, except for a small slot called the windway alongside the mouth. This allows air to flow as a sheet of wind directed towards the pipe's mouth. Flat pieces of metal or wood called ears may be attached to the sides of the mouth for tuning purposes, and a horizontal dowel called a roller or beard may be affixed at the pipe to ensure prompt pipe speech.
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