that when it is released it rebounds with force onto the fingerboard, yielding a sharp, percussive snapping sound. Examples can be found in Bartók's 44 Duos (No. 42, Arabian Song) and Solo Sonata for violin. . Mute Attaching a small rubber, wooden, or metal device called a "mute" to the bridge of the violin alters the tone, softening the instrument's sound by adding mass to the bridge and therefore reducing its ability to vibrate freely, decreasing volume and giving a more mellow tone, with fewer audible overtones. In performances, it may give a desired dulled effect. Mutes are mostly used in orchestras with the entire string section playing with mutes, resulting in a soft, hushed sound quality. Parts to be played muted are marked con sord., for the Italian sordino or occasionally mit Dämpfer in German. (The instruction to take off the mute is senza sord., sometimes marked just senza or "ohne Dämpfer" in German.) In French, instruction is given for application of mutes at the beginning of muted passages, "mettez les sourdines", and for removal at the end "ôtez les sourdines". Sharing the same name but with a completely different purpose, massive metal, rubber, or wooden "practice mutes" or "hotel mutes" are available. These mutes are used to drastically reduce the volume when practicing where others can be disturbed. Tuning Violins are tuned by turning the pegs in the pegbox under the scroll, or by turning the fine tuner screws at the tailpiece. A violin always has pegs, but fine tuners (also called fine adjusters) are optional to have only one. Fine tuners permit the string pitch to be adjusted in very small amounts much more easily than by using the pegs. Most fine tuners work by turning a small metal screw, which moves a lever that is attached to the end of the string. (Another type of tuner, using a screw to crimp a short segment of the string's afterlength near the tailpiece, is sometimes found, most generally on smaller instruments.) Fine tuners are usually recommended for younger players, fractional-sized instruments, those using high tension or metal strings, or beginners. Fine tuners are most useful with solid metal strings; since they do not stretch as much as synthetics, solid-core strings can be touchy to tune with pegs alone. Fine tuners are not useful when using gut strings; since these strings are more "stretchy", the tuners lack enough range