There are many conceivable ways to map 42edo onto the onto the Lumatone keyboard. However, as both of its fifths are about as far away from just as possible, neither the sharp or the flat versions of the Standard Lumatone mapping for Pythagorean work particularly well.
Diatonic
The flat fifth is the same as that of 7edo, which if used would result in six mutually-exclusive rings of fifths, so to cycle through all notes using the circle of fifths you need to use the sharp fifth instead, which gives ultrapyth.
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Pseudo-Isomorphic Pseudo-Diatonic
A pseudo-isomorphic pseudo-diatonic mapping for 42edo that duplicates note 0 (as note 18) enables diatonic playing while keeping octaves level — it is the 43edo diatonic layout, but with only 42 unique notes per octave. Bryan Deister has demonstrated this mapping in 42edo groove (2025).
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Lemba
The Lemba mapping is also of particular interest despite using a non-patent val.
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