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* Intercalary leap tunings based on things like [[16/15ths equal temperament]] where an octave has an alternating number of steps like a calendar year
* Intercalary leap tunings based on things like [[16/15ths equal temperament]] where an octave has an alternating number of steps like a calendar year


== 49edo - extended primality ==
== 666edo Factor 9 grid ==
{{primes in edo|49|columns=20}}
Factor 9 grid is a just intonation esoteric scale that begins by taking a number of the form 2^n * 63, n є Z, and adding linearly 9 * 2^(n-1) Hz to it until octave equivalence is reached.
 
If A is assumed to be equal to 432Hz, the correspondences in 666EDO are as follows:
{| class="wikitable"
|+Factor 9 grid in 666EDO
!Frequency
!Step
!
!
|-
|432
|0
|
|
|-
|450
|39
|
|
|-
|468
|77
|
|
|-
|486
|113
|
|
|-
|504
|148
|
|
|-
|540
|214
|
|
|-
|576
|276
|
|
|-
|612
|335
|
|
|-
|648
|390
|
|
|-
|684
|442
|
|
|-
|720
|491
|
|
|-
|756
|538
|
|
|-
|792
|582
|
|
|-
|828
|625
|
|
|-
|864
|666
|
|
|}


== New album project ==
== New album project ==