Classical guitar fingerboard and placed at points that divide the length of string mathematically. The strings' vibrating length is determined when the strings are pressed down behind the frets. Each fret produces a different pitch and each pitch spaced a half-step apart on the 12 tone scale. The ratio of the widths of two consecutive frets is the twelfth root of two (formula_1), whose numeric value is about 1.059463. The twelfth fret divides the string in two exact halves and the 24th fret (if present) divides the string in half yet again. Every twelve frets represents one octave. This arrangement of frets
Eleven-string alto guitar 11-string alto guitar. This design introduced two main elements. The first was to provide conventional lute tuning by tuning the first six strings a minor third higher (hence the name "alto guitar"). It is equivalent to putting a capo on the third fret of the normal prime guitar. The second element was to add five extra strings to accommodate low notes. The typical 11-string alto guitar tuning is (from low to high strings): Bb1 C2 D2 Eb2 F2 G2 C3 F3 Bb3 D4 G4. Current luthiers who build 11-string alto guitars, primarily located in Sweden, include Heikki Rousu and Roger