7afdo

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7afdo

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Prime factorization	7 (prime)
Dual sharp fifth	11/7 (782.492c)
Dual flat fifth	10/7 (617.487c)

7afdo (arithmetic frequency division of the octave), or 7odo (otonal division of the octave), divides the octave into seven parts of 1/7 each. As a scale it may be known as mode 7 of the harmonic series or the Over-7 scale. As 7 is a small odd number, this AFDO does not contain a perfect fifth or any reasonable approximation to it, and it is relatively poor for its size at creating traditional tonal music.

Intervals

#	Cents	Ratio	Decimal	Interval name	Audio
0	0	1/1	1.0000	perfect unison
1	231.2	8/7	1.1429	supermajor second
2	435.1	9/7	1.2857	supermajor third
3	617.5	10/7	1.4286	high tritone
4	782.4	11/7	1.5714	undecimal minor sixth
5	933.1	12/7	1.7143	supermajor sixth
6	1071.7	13/7	1.8571	tridecimal submajor seventh
7	1200.0	2/1	2.0000	perfect octave

Scala files

• Harmd-mix
• Oheptad – same, but starts with 8/7