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Ed7 means Division of the Seventh Harmonic (7/1) into n equal parts.

Division of the seventh harmonic into n equal parts

The seventh harmonic is particularly wide as far as equivalences go. There are (at absolute most) ~3.9 heptataves within the human hearing range; imagine if that were the case with octaves. If one does indeed deal with heptatave equivalence, this fact shapes one's musical approach dramatically.

Individual pages for ED7s