Monarch

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Archtone is a rank-3 straddle temperament tempering out 64/63[+3] and 81/80[-3] in the 2.-3.+3.5.7 subgroup. The name comes from Archy and Meantone, the two temperaments combined to make Archtone. They are linearly independent, but extensions and erac tunings make use of combining the two tunings of 3. The name may also be read with the arch- prefix, implying that this is a tonality of greater scope or importance.

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110edo is approximately my standard for both Meantone septal diasem and Archy pental blackdye, with 110d 18:6:4 (50 patent 9:3:2) diasem and 110bc 16:9:4 blackdye. This exact tuning system is somewhat impractical to use, but the two scales share the same 5/4 and 9/7, which led to the temperament now called Archtone. I believe that tuning major thirds accurately rather than minor thirds is generally more important to a pure sound. 110edo also happens to contain a very good Intergan generator, which splits the Meantone fourth in half, and makes for a good superset of Archtone.

There are multiple ways to optimize Archtone. The Meantone diatonic major third 81/64[-3] is broadly a sharp 5/4, which has several benefits when used in Archy pental blackdye according to the above standards. It refines aberrismic melodic properties, preserves the tuning of 7/5, and happens to coincide with a +1+1 major triad. The diatonic minor third cannot be tuned to 6/5 or sharper without an excessively flat fifth.

On the other hand, the narrower capture zone of 9/7 and multiple non-2 primes in its factorization imply that it should be tuned more accurately. This may be done in two main ways for Meantone septal diasem: In 110edo, 9/7 is 81/64[+3], a straightforward Archy diatonic major third. In 86edo, 7/6 is tuned more accurately with 32/27[+3] due to the sharper 3. 9/7 is obtained by 3/2[-3] / (32/27[+3]), subtracting the Archy minor third from the Meantone fifth. This sacrifices 9/7 to improve sharp 7 and flat 11.