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Soft pedal : ウィキペディア英語版
Soft pedal

The ''soft pedal'' (or una corda pedal) is one of the standard pedals on a piano, generally placed leftmost among the pedals. On a grand piano this pedal shifts the whole action including the keyboard slightly to the right, so that hammers which normally strike all three of the strings for a note strike only two of them. This softens the note and also modifies its tone quality. Tone quality is also affected by forcing the remaining two strings being struck to make contact with a part of the hammer felt which is not often hit (due to the whole action being shifted); this results in a duller sound, as opposed to the bright sound which is usually produced (due to the felt being hardened from regular use).
==History==
The essential function of the soft pedal was invented by Bartolomeo Cristofori, the inventor of the piano. On some of his pianos, it was possible to move the hammer mechanism so that the hammers struck just one of the two strings per note. Cristofori's mechanism was a hand stop, necessitating a free hand for its use. By Mozart's time (see Fortepiano), mechanisms had been invented that permitted the same function to be carried out by a knee lever (located below the keyboard), and in the late 18th century the pedal mechanism familiar to us today was introduced.
In the 18th and early 19th centuries, the piano had evolved to have three strings on most of the notes. The soft pedal of this time was more effective than today, since it was possible to use it to strike three, two or even just one string per note—this is the origin of the name "una corda", Italian for "one string". In modern pianos, the strings are spaced too closely to permit a true "una corda" effect—-if shifted far enough to strike just one string on one note, the hammers would also hit the string of the next note. ''See Piano history and musical performance''.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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