| 摘要 |
A device mounted on the fretboard of a stringed musical instrument for quickly locating and playing simple and complex chords. The device includes a keyboard having a plurality of reciprocable buttons arranged in adjacent rows along the frets overlying the strings of the instrument and longitudinally extending reciprocable keys in contact with a button in adjacent rows. Depression of individual buttons and keys with the fingers enables different simple and compound chords to be quickly located and played on the instrument by contact of shafts on the depressed buttons with the strings at different individual and combined locations on the fretboard.
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