![]() ![]() These include the player's lips controlling the stream of air as it is directed to the edge, without mechanical assistance. ![]() Īs is clear from the Hornbostel-Sachs heading, there are several ways in which a duct can be formed. This flow-controlled "air reed" is a definitive characteristic of all flutes, which therefore all have an edge or equivalent air-splitting device. The edge splits the air in a manner that alternately directs it into and outside of the tube, setting the contained column of air into periodic vibration. The accompanying illustration of the mouthpiece of a recorder shows a wooden block (A) with a channel carved into the body of the instrument (B), together forming a duct that directs a ribbon of air across an opening toward a sharp edge (C). Cross-section of the mouthpiece of a recorder, indicating a block (A), duct (B), and edge (C) ![]()
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