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In page Recorder (musical instrument):

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The pitch and volume of the recorder sound are influenced by the speed of the air travelling through the windway, which may be controlled by varying the breath pressure and the shape of the vocal tract. The sound is also affected by the turbulence of the air entering the recorder. Generally speaking, faster air in the windway produces a higher pitch. Thus blowing harder causes a note to sound sharp whereas blowing the note gently causes it to sound flat. Knowledge of this fact and the recorder's individual tonal differences over its full range will help recorders play in tune with other instruments by knowing which notes will need slightly more or less air to stay in tune. As mentioned above at Harmonic profile, blowing much harder can result in overblowing.[citation needed]