Stringed musical instrument with keys, which simultaneously plays the melody, base and accompaniment

摘要

Stringed musical instrument with keys, which plays the melody, base and accompaniment simultaneously (or separately), having a supplementary special rider 7 and a supplementary special keyboard 5, and which, depending on the direction in which the strings are struck (in threes) and the change of area with the thumb of the right hand and, where necessary, the pressure of the thumb on the strings 16 above the special keyboard 5, assisted by the other fingers (of the left and right hands playing on the ordinary keyboard 4), produces either the melody and accompaniment simultaneously, or the melody, base and accompaniment simultaneously (or separately).