Lumatone mapping for 38edo
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There are many conceivable ways to map 38edo onto the onto the Lumatone keyboard. However, it has 2 mutually-exclusive rings of fifths, so the Standard Lumatone mapping for Pythagorean is not one of them. Even the b val does not generate a diatonic or antidiatonic scale, and the bb val is very flat indeed.
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Neutral thirds
Instead, as slicing the perfect fifth in two results in an essentially perfect 11/9, it makes a lot of sense to use the neutral thirds mapping.
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Astrology
Or if you want greater range while still reaching a lot of good intervals in few steps, the Astrology mapping works well:
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