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In page Recorder (musical instrument):

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Both fingers and the breath can be used to control the pitch of the recorder. Coordinating the two is essential to playing the recorder in tune and with a variety of dynamics and timbres. On an elementary level, breath pressure and fingerings must accord with each other to provide an in-tune pitch. As an example of a more advanced form of coordination, a gradual increase in breath pressure combined with the shading of holes, when properly coordinated, results in an increase in volume and change in tone colour without a change in pitch. The reverse is possible, decreasing breath pressure and gradually lifting fingers.[citation needed]