There are many conceivable ways to map 19edo onto the onto the Lumatone keyboard. Only one, however, agrees with the Standard Lumatone mapping for Pythagorean.
Diatonic
This is "Preset 4 — 19-ET Bosanquet" in version 1.0 of the official manual, and "Preset 5 — 19-EDO Bosanquet" in version 1.21.
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Hanson
The 3L 1s Hanson mapping is a good option if you want to extend your range while making well-tuned chords easy to play. This mapping works especially well since 19edo can be conceptualised as a chain of essentially pure 6/5s.
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Semiquartal
The 4L 1s mapping is also an excellent option, which also extends the range over the standard layout and makes the diatonic scale easier to play than on the Hanson layout.
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Sensi
The Lumatone mapping for sensi is also another option, putting the notes of minor and major chords extremely close to each other:
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Magic
The Magic mapping has an even wider range and makes 5-limit chords just as easy to play, but the 3L 1s scale is somewhat lopsided with its 6:1 step ratio and higher limit intervals require more awkward finger stretches.
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The 1L 2s layout is even more efficient in terms of range, but the chroma goes downwards.
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