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发表于 2003-4-13 20:33:00
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转贴一下（中国的网站封锁真是变态！）
The fine-tuneable guitar
Ever since guitars have been built, numerous attempts to overcome the inaccuracies of intonation by means of instrument modifications have been made and failed.
Inaccuracies of current tuning arise from four factors: the compromise of fixed fret positions, inhomogenities of the strings, the instrument and the way of playing.
Imperfections in strings may be reduced but hardly eliminated. It remained to find a solution via the first factor, the frets.
After a lot of computations and series of experiments the guitar maker WALTER J. VOGT was led to believe in an new fretboard system tunable exactly to tempered scale. He demonstrated, that the scales displayed distinctly divergent intervals when the same strings were transfered from one to another test instrument.
Finally Walter Vogt succeeded in designing a fretboard on which all 110 - 120 semitones can be set individualy.
Just before he died in 1990 he accomplished a perfected system for accurate tempered tuning.
This precision fretboard system now continues to exist as
Fret mobile. Chouard
It becomes immediately audible that instruments thus accurately tuned to tem- pered scale sound richer and holding a sound longer than those with standard scaling and fixed frets. The perfect harmonic tuning leeds to a really new sound of guitar playing.
An important advantage for the pro- fessional is that the guitar will rarely, if ever need retuning during the course of a concert performance. It can be played at least as easily than an "old-fashioned" guitar and permit the performer to concentrate fully on his interpretation.
The new system involves new possibilities for guitarists playing together with other musicians. As well it has an important influence in recording guitar music, especially with improved recording techniques, because intonation errors become even more audible on the modern guitar - built to provide greater selectivity and a broader tonal spectrum.
Every concert guitar can be rebuilt to the fretboard system with the precision equipment developed especially for this purpose.
Accurate tuning can now also be applied to similar systems on baroque lutes, mandolins and all other string instruments on which frets are used.
The frets are made of a special plastic and can be moved in metal rails however they remain in the individualy fixed position.
For tuning the new guitar use the aid of a standard tuning device (such as the TLA TUNING SET CTS-5). The time required for the player to bring all frets in accurate position varies from 30 to 50 minutes.
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