closure of open fingerholes lowers the pitch. Holes 6 and 7 On most "baroque" modelled modern recorders, the lower two fingers of the lower hand actually cover two holes each (called "double holes"). Whereas on the vast majority of baroque recorders and all earlier recorders these two fingers covered a single hole ("single holes"), double holes have become standard for baroque modelled modern recorders. By covering one or both of these two, smaller holes, a recorder player can play the notes a semitone above the lowest note and a minor third above the lowest note, notes that are possible on single holed recorders only through the partial covering of those holes, or the covering of the bell. Covering the bell The open end of the bore facing away from the player (the "bell") may be covered to produce extra notes or effects. Because both hands are typically engaged in holding the recorder or covering the finger holes, the covering of the bell is normally achieved by bringing the end of the recorder in contact with the leg or knee, typically achieved through a combination of bending of the torso and/or raising of the knee. Alternatively, in rare cases instruments may be equipped with a key designed to cover the bell ("bell key"), operated by one of the fingers, typically the pinky finger of the upper hand, which is not normally used to cover a hole. Fingerings with a covered bell extend the recorder's chromatic playable range above and below the nominal fingered range. Air 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. Breath The technique of inhalation and exhalation for the recorder differs from that of many