The clavichord is the oldest stringed keyboard instrument, and slightly predates the Harpsichord and of course the piano. In the 18th century, the clavichord reached peak exposure but only in a few countries, most clearly in Austria=Germany, Portugal, and Scandinavia, as well as to a lesser extent in Italy, it is virtually unknown in France and England.
The clavichord is the simplest keyboard action, it has one bridge lying on a resonant soundboard, at the other end a fret, called a tangent is mounted on the key, and when the key strikes the string, it frets the note and allows it to vibrate from the fret to the bridge, albeit at a quieter level than the harpsichord, there is felt woven to the left of the keys to stop the string from vibrating when the note is let go, and to stop the out of tune left of the key section of string from vibrating when the note is fretted.
Clavichords can be fretted, where 2.3 or 4 strings share the same pair of strings but by striking at different position sound different notes, the limitation of this is you can't play more than one not at a time on the fretted pair of strings, and if you happen to strike to at the same time an unpleasant dissonance is made. Because of this, by the early 1700s the unfretted clavichord was invented and became more popular as the century went on. Unfretted clavichords have one pair of strings for each individual note, so any combination of notes can be played at the same time, how ever they have more strings loading down the soundboard and can be somewhat quieter
the clavichord is the quietest keyboard instrument and is not really loud enough to accompany other instruments like guitar or violin. Badly built clavichords tend to be even quieter, and really well built ones can be much louder, but never close to as loud as a Harpsichord or guitar. The clavichord plays loud and soft like a piano but instead of Forte to Piano, it is more like Piano to PPP
the clavichord is the only keyboard that has finger controlled vibrato and pitch variation, by pushing the key deeper, the strings are stretched more and the pitch is raised, by pushing the key up and down while still holding the note a vibrato can be achieved.
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