Lumatone mapping for 33edo: Difference between revisions
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Add Bryan Deister's Augmented (Triforce) + Bohpier mapping |
→Augmented (Triforce) + Bohpier: Add forward chroma version and edit the description text to be for both versions |
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{{Lumatone EDO mapping|n=33|start=24|xstep=7|ystep=-2}} | {{Lumatone EDO mapping|n=33|start=24|xstep=7|ystep=-2}} | ||
== Augmented (Triforce) + Bohpier == | == Augmented (Triforce) + Bohpier Lumatone mappings == | ||
[[Bryan Deister]] has demonstrated | [[Bryan Deister]] has demonstrated two mappings for [[33edo]] that function for the temperaments [[Augmented]] ([[Augmented family#Triforce|Triforce]], 33d val, [[3L 3s]] scale with 7:4 step ratio) and [[Bohpier]] (33cd val, [[8L 1s]] scale with 4:1 step ratio). The down-right (forward chroma version) or rightward (reverse chroma version) generator is a somewhat flat Alpharabian tendoneutral second ~[[12/11]] which can be stacked to get several consonant intervals; however, some of them map inconsistently. Two of these generators make a near-just neogothic minor third ~[[13/11]], mapped consistently. Three of these generators make a near-just septimal major third ~[[9/7]] by sound, but the mapping only works if 9/7 is constituted as (3♭ × 3♯) ÷ 7 or as 9 ÷ 7♭ (33d val). Four of these generators make a near-just lesser septimal tritone ~[[7/5]], mapped consistently ([[patent val]] or 33cd val). Six of these generators make a flat classic major sixth ~[[5/3]] by sound, but the mapping only works if 5/3 is constituted as 5♭ ÷ 3 (33c val). Seven of these generators make a near-just classic minor seventh ~[[9/5]] by sound, but the mapping only works if 9/5 is constituted as (3♭ × 3♯) ÷ 5 or as 9 ÷ 5♭ (33c val). The range is a bit over six octaves in the forward chroma version or five octaves in the reverse chroma version; in both cases, the octaves slope moderately downwards resulting in a vertical wraparound. | ||
=== Forward chroma === | |||
Demonstrated in [https://www.youtube.com/shorts/mkaaAJEyGFU ''33edo riff''] (2025). | |||
{{Lumatone EDO mapping|n=33|start=0|xstep=7|ystep=-3}} | |||
=== Reverse chroma === | |||
Demonstrated in [https://www.youtube.com/watch?v=GypR6x_Ih1I ''33edo jam''] (2025). | |||
{{Lumatone EDO mapping|n=33|start=15|xstep=4|ystep=3}} | {{Lumatone EDO mapping|n=33|start=15|xstep=4|ystep=3}} | ||
{{Navbox Lumatone}} | {{Navbox Lumatone}} | ||
Revision as of 09:26, 6 August 2025
There are many conceivable ways to map 33edo onto the onto the Lumatone keyboard. Only one, however, agrees with the Standard Lumatone mapping for Pythagorean.
Diatonic
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Terrain
While 33edo is poor at approximating harmonics in general, it does manage several composite ratios within fractions of a cent. The terrain mapping is a particularly efficient way to make those easy to play together.
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Semiquartal
To maximise your range while keeping octaves near horizontal, use the 4L 1s layout.
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Augmented (Triforce) + Bohpier Lumatone mappings
Bryan Deister has demonstrated two mappings for 33edo that function for the temperaments Augmented (Triforce, 33d val, 3L 3s scale with 7:4 step ratio) and Bohpier (33cd val, 8L 1s scale with 4:1 step ratio). The down-right (forward chroma version) or rightward (reverse chroma version) generator is a somewhat flat Alpharabian tendoneutral second ~12/11 which can be stacked to get several consonant intervals; however, some of them map inconsistently. Two of these generators make a near-just neogothic minor third ~13/11, mapped consistently. Three of these generators make a near-just septimal major third ~9/7 by sound, but the mapping only works if 9/7 is constituted as (3♭ × 3♯) ÷ 7 or as 9 ÷ 7♭ (33d val). Four of these generators make a near-just lesser septimal tritone ~7/5, mapped consistently (patent val or 33cd val). Six of these generators make a flat classic major sixth ~5/3 by sound, but the mapping only works if 5/3 is constituted as 5♭ ÷ 3 (33c val). Seven of these generators make a near-just classic minor seventh ~9/5 by sound, but the mapping only works if 9/5 is constituted as (3♭ × 3♯) ÷ 5 or as 9 ÷ 5♭ (33c val). The range is a bit over six octaves in the forward chroma version or five octaves in the reverse chroma version; in both cases, the octaves slope moderately downwards resulting in a vertical wraparound.
Forward chroma
Demonstrated in 33edo riff (2025).
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Reverse chroma
Demonstrated in 33edo jam (2025).
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