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Is it that modes are altering comments?
Thus A,C, Eb is correct and A,C,D# would be not the best. But if you construct dim7 chords you can build an dim7 on each tone of the tetrad A,C,Eb,Gb and transform this chord to D#,F#,A,C and all other enharmonic exchanged chords. That's why the dim7-chord...