68edo: Difference between revisions

68edo's step is half of the step size of [[34edo]], which does well in the 5-limit but not so well in the 7-limit, and one quarter the size of [[17edo]], which does well in the [[3-limit]], but not so well in the [[5-limit]]. The luck continues: 68 is a strong [[7-limit]] system, but does not do as well in the [[11-limit]]; though it's certainly usable for that purpose, it does not represent the 11-limit diamond [[consistent]]ly since [[11/9]] is not mapped to its best approximation. However, 68edo maps many higher primes better than it does 11 (specifically 13 and 23 inherited from 17edo, 17 inherited from 34edo, and 19 and 31 new to 68edo), notably being [[consistent]] in the entire no-11s 25-[[odd limit]] add-31. It achieves this by having a consistent sharp tendency among all primes up to 31, save 11 and 29. Therefore, a slight octave compression, such as in [[158ed5]] or [[191ed7]], can improve upon the accuracy of 68edo's harmonic series.

As a 7-limit system, 68et [[tempering out|tempers out]] [[2048/2025]], [[245/243]], [[4000/3969]], [[15625/15552]], [[3136/3125]], [[6144/6125]], and [[2401/2400]]. It [[support]]s [[octacot]], [[shrutar]], [[hemiwürschmidt]], [[hemikleismic]], [[clyde]] and [[neptune]] temperaments, and supplies the [[optimal patent val]] for 11-limit [[hemikleismic]].

The 3rd degree of 68edo can be used as a generator for [[23edo and octave stretching|stretched 23edo]], which also acts as the [[quartkeenlig]] temperament tempering out the quartisma, 385/384 and 6250/6237. It results in a 23edo scale with octaves stretched by 1 step of 68edo (octaves of 1217.65{{c}}). It also works as a [[22L 1s]] MOS of the quartkeenlig temperament.

The 5th degree of 68edo can be used as a generator for [[88cET]], while two steps almost perfectly approximate [[50/49]], allowing for the tempering out of 2/(50/49)³⁴.

Since 68 factors into {{factorization|68}}, 68edo has subset edos {{EDOs| 2, 4, 17, and 34 }}. Important supersets include [[612edo]], a 5-limit record-holder, and [[680edo]].

=== Interval mappings ===

{{Q-odd-limit intervals}}

{{Q-odd-limit intervals|68.1|apx=val|header=none|tag=none|title=15-odd-limit intervals by 68e val mapping}}

: ''See also: [[List of MOS scales in 68edo]], [[34edo #Scales]], and [[17edo #Scales]].''