1323/1280

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1323/1280, the septimal 2/7-tone, is a 7-limit ratio very close to the step of 21edo.

Theory

If taken as a comma to be tempered, it produces greenwood. If it is taken as a period and assigned to 1\21 of the octave, it produces akjayland and temperaments like 441 & 1848.

[-169,63,-21,42⟩ is a comma that results from the difference of 21 instances of this interval with the octave. For EDOs N up to ~5000, it is tempered out if and only if 21 divides N.

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