| 摘要 |
When a musician presses the digital of a musical instrument, a digital identifying number is transmitted to a separate sound generator, where a tone of the appropriate pitch is generated. A musical scale selecting and musical key signature actuating apparatus intercepts this transmission. The apparatus contains a number changer which can change the numbers transmitted to the sound generator so that the same sequence of instrument digitals can sound either the diatonic scale or a musical scale having only six tones per octave, and a musician can play from music written in different diatonic musical keys with the sharps or flats in its key signature automatically actuated.
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