Sound filtering |

Sound filtering (Italian filar un suono, French filer un son) – designation of a uniformly flowing, long sustained sound. It is performed with the preservation of the sound strength, crescendo, diminuendo or with a transition after crescendo to diminuendo.

Initially, the term was used only in the field of singing art, later it was extended to perform on all instruments capable of leading a melody – strings and winds. The thinning of sound in singing and playing wind instruments requires a large volume of the lungs; when playing stringed instruments, it is achieved by continuous bowing.