This unisonoric Harmoshka has in the treble (melody side) a diatonically ordered tone stock of b-e3 following the scale A major. In addition to these scale tones there are only 4 tones beyond A major (b1, c2, es2, f2) in the middle range, what defines the musical possibilities. In contrast, a fully chromatic instrument would be included in the specified tone range 12 tones beyond A major, which increases significantly the playing possibilities.