Talk:Meantone: Difference between revisions

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:::::: Decided to look at where the higher harmonics end up on the [[Lumatone mapping for 55edo]]. While the harmonics up to 13 fit better with the lowest harmonics in the 6L 1s mapping, the 17th and 19th harmonics fit together best with the lowest harmonics in the Bosanquet mapping (and the 23rd harmonic is awkward with both); of course this is subject to extensive modification if playing in a key signature that causes vertical wrapround. So I have the barest beginnings of an idea for badness rating (nowhere near complete since I don't know how to compute the original types of badness) that takes into account playability, but it is going to be hamstrung by such differences in key layouts. [[User:Lucius Chiaraviglio|Lucius Chiaraviglio]] ([[User talk:Lucius Chiaraviglio|talk]]) 10:03, 9 January 2025 (UTC)

== Unlisted(?) strong 7-limit Meantone extension (maybe related to Catasyc or Laruquadbiyoti?) ==

The Septimal Meantone tempering out Harrison's comma ([-13 10 0 -1⟩ = 59049/57344) thus equating [[7/4]] to C-A♯ (fifthspan +10) actually does not give the proper closest approximation to the 7th harmonic for some of the higher-numered equal divisions of the octave having fifths more flat than 50EDO. For a few of these, the next closer approximation equates [[7/4]] to C-G𝄪𝄪(*) (fifthspan +29), tempering out the comma |-43 29 0 -1⟩ = 68630377364883/61572651155456. This starts with [[69edo]], for which a [[Lumatone mapping for 69edo|Lumatone mapping]] has recently been demonstrated [https://www.youtube.com/watch?v=ZAqPonAHuUM&lc=Ugy-2hiGCW-YSngIvmZ4AaABAg.AIVXd3HGZlYAIZiyHbHV7H for playing music that sounds pretty good]. While I am not a keyboard player myself, the reach does look like it might be a bit awkward in combination with [[Devichromic chords]] on the layout for that, but very easily reached on the sharp Diatonic layout as long as it doesn't fall into the crack of missed notes, and somewhat awkward on the flat Diatonic layout if the crack of missed notes can be avoided for both it and its root note. I have tried searching for this comma on Xenharmonic Wiki by monzo and ratio, but it does not turn up, and nothing hinting at such an extension is currently in Meantone or Meantone family. Unfortunately I haven't thought of a good placeholder name for this yet (unlike Mildtone in the section above), so temporarily I'll have to make do without.

(*)For readability, it would be best to find a better way of notating this in an actual score, since otherwise a simple 4:5:6:7 chord will produce overlapping notes with C-G𝄪♯.

Putting 81/80 and 68630377364883/61572651155456 into Graham Breed's x31eq Temperament Finder Unison Vector Search ([https://x31eq.com/pyscript/uv.html?uvs=81%3A80+%5B-43%2C29%2C0%2C-1%3E&page=0&limit=7 quick link for initial search results]) yields (with my best effort to restore line breaks in the output):

{BEGIN x31eq OUTPUT}

Meantone extension with an extra dimension (19 & 69p)

Equal Temperament Mappings

2 3 5 7

[ ⟨ 19 30 44 53 ]

⟨ 69 109 160 194 ] ⟩

Reduced Mapping

2 3 5 7

[ ⟨ 1 2 4 15 ]

⟨ 0 -1 -4 -29 ] ⟩

TE Generator Tunings (cents)

⟨1202.0930, 505.5912]

TE Step Tunings (cents)

⟨25.09362, 10.51180]

TE Tuning Map (cents)

⟨1202.093, 1898.595, 2786.007, 3369.251]

TE Mistunings (cents)

⟨2.093, -3.360, -0.306, 0.425]

Show POTE tunings

This is a trivial subgroup of the rational numbers so TE is TE is TE.

Complexity 4.171718

Adjusted Error 4.191225 cents

TE Error 1.492944 cents/octave

Unison Vectors

[-4, 4, -1, 0⟩ (81:80)

[-15, 1, 7, -1⟩ (234375:229376)

[-11, -3, 8, -1⟩ (390625:387072)

[7, 7, -9, 1⟩ (1959552:1953125)

{END x31eq OUTPUT}

I tried searching on the Xenharmonic Wiki for the Unison Vectors other than 81/80 that it gave me:

Searching for 234375/229376 on here does not turn up a temperament, but does turn up a few EDO values tempering it out, of which 107b fits with this extension.

Searching for 390625/387072 on here turns up "Catasyc or Laruquadbiyoti" temperaments in [[Tour of regular temperaments]], but does not link to an article, so I have no idea how closely these are related to Meantone

Searching for 1959552/1953125 on here turns up [[Parkleiness temperaments]], but these do not have expected EDO values 69, 88, or 107b.

For Subsets, x31eq outputs:

{BEGIN x31eq OUTPUT}

Equal Temperaments

19, 38d, 57dd, 69p, 50d, 88p, 31d, 107b, 76dd, 12dd

Rank 2 Temperament

complexity error

(cent)

Meantone+ 4.172 4.191 19 & 69p

{END x31eq OUTPUT}

Looking for applicable equal temperaments on my own (and including a d and/or c val at each end to show where it quits working), I found: 50d, 69, 88, 107b, 126bcd (and no secondary series since this always has c and/or d warts).

I have not yet done any work to see what higher-limit extensions would go with Mildtone beyond clicking on the "11-limit" and "13-limit" buttons in x31eq to see what output it would yield; with "13-limit", it starts to come up with rather odd output, so I stopped there.

Added: [[User:Lucius Chiaraviglio|Lucius Chiaraviglio]] ([[User talk:Lucius Chiaraviglio|talk]]) 07:41, 27 May 2025 (UTC)

@@ Line 307: / Line 307: @@
 :::::: Decided to look at where the higher harmonics end up on the [[Lumatone mapping for 55edo]].  While the harmonics up to 13 fit better with the lowest harmonics in the 6L 1s mapping, the 17th and 19th harmonics fit together best with the lowest harmonics in the Bosanquet mapping (and the 23rd harmonic is awkward with both); of course this is subject to extensive modification if playing in a key signature that causes vertical wrapround.  So I have the barest beginnings of an idea for badness rating (nowhere near complete since I don't know how to compute the original types of badness) that takes into account playability, but it is going to be hamstrung by such differences in key layouts.  [[User:Lucius Chiaraviglio|Lucius Chiaraviglio]] ([[User talk:Lucius Chiaraviglio|talk]]) 10:03, 9 January 2025 (UTC)
+== Unlisted(?) strong 7-limit Meantone extension (maybe related to Catasyc or Laruquadbiyoti?) ==
+The Septimal Meantone tempering out Harrison's comma ([-13 10 0 -1⟩ = 59049/57344) thus equating [[7/4]] to C-A♯ (fifthspan +10) actually does not give the proper closest approximation to the 7th harmonic for some of the higher-numered equal divisions of the octave having fifths more flat than 50EDO.  For a few of these, the next closer approximation equates [[7/4]] to C-G𝄪𝄪(*) (fifthspan +29), tempering out the comma |-43 29 0 -1⟩ = 68630377364883/61572651155456.  This starts with [[69edo]], for which a [[Lumatone mapping for 69edo|Lumatone mapping]] has recently been demonstrated [https://www.youtube.com/watch?v=ZAqPonAHuUM&lc=Ugy-2hiGCW-YSngIvmZ4AaABAg.AIVXd3HGZlYAIZiyHbHV7H for playing music that sounds pretty good].  While I am not a keyboard player myself, the reach does look like it might be a bit awkward in combination with [[Devichromic chords]] on the layout for that, but very easily reached on the sharp Diatonic layout as long as it doesn't fall into the crack of missed notes, and somewhat awkward on the flat Diatonic layout if the crack of missed notes can be avoided for both it and its root note.  I have tried searching for this comma on Xenharmonic Wiki by monzo and ratio, but it does not turn up, and nothing hinting at such an extension is currently in Meantone or Meantone family.  Unfortunately I haven't thought of a good placeholder name for this yet (unlike Mildtone in the section above), so temporarily I'll have to make do without.
+(*)For readability, it would be best to find a better way of notating this in an actual score, since otherwise a simple 4:5:6:7 chord will produce overlapping notes with C-G𝄪♯.
+Putting 81/80 and 68630377364883/61572651155456 into Graham Breed's x31eq Temperament Finder Unison Vector Search ([https://x31eq.com/pyscript/uv.html?uvs=81%3A80+%5B-43%2C29%2C0%2C-1%3E&page=0&limit=7 quick link for initial search results]) yields (with my best effort to restore line breaks in the output):
+{BEGIN x31eq OUTPUT}
+Meantone extension with an extra dimension (19 & 69p)<br>
+Equal Temperament Mappings<br>
+	3	5	7	<br>
+[ ⟨	19	30	44	53	]<br>
+⟨	69	109	160	194	] ⟩<br>
+Reduced Mapping<br>
+	3	5	7	<br>
+[ ⟨	1	2	4	15	]<br>
+⟨	0	-1	-4	-29	] ⟩<br>
+TE Generator Tunings (cents)<br>
+⟨1202.0930, 505.5912]<br>
+TE Step Tunings (cents)<br>
+⟨25.09362, 10.51180]<br>
+TE Tuning Map (cents)<br>
+⟨1202.093, 1898.595, 2786.007, 3369.251]<br>
+TE Mistunings (cents)<br>
+⟨2.093, -3.360, -0.306, 0.425]<br>
+Show POTE tunings<br>
+This is a trivial subgroup of the rational numbers so TE is TE is TE.<br>
+Complexity 	4.171718<br>
+Adjusted Error 	4.191225 cents<br>
+TE Error 	1.492944 cents/octave<br>
+Unison Vectors
+    [-4, 4, -1, 0⟩ (81:80)<br>
+    [-15, 1, 7, -1⟩ (234375:229376)<br>
+    [-11, -3, 8, -1⟩ (390625:387072)<br>
+    [7, 7, -9, 1⟩ (1959552:1953125)<br>
+{END x31eq OUTPUT}
+I tried searching on the Xenharmonic Wiki for the Unison Vectors other than 81/80 that it gave me:
+Searching for 234375/229376 on here does not turn up a temperament, but does turn up a few EDO values tempering it out, of which 107b fits with this extension.
+Searching for 390625/387072 on here turns up "Catasyc or Laruquadbiyoti" temperaments in [[Tour of regular temperaments]], but does not link to an article, so I have no idea how closely these are related to Meantone
+Searching for 1959552/1953125 on here turns up [[Parkleiness temperaments]], but these do not have expected EDO values 69, 88, or 107b.
+For Subsets, x31eq outputs:
+{BEGIN x31eq OUTPUT}
+Equal Temperaments<br>
+, 38d, 57dd, 69p, 50d, 88p, 31d, 107b, 76dd, 12dd<br>
+Rank 2 Temperament<br>
+	complexity 	error<br>
+(cent) 	<br>
+Meantone+ 	4.172 	4.191 	    19 & 69p<br>
+{END x31eq OUTPUT}
+Looking for applicable equal temperaments on my own (and including a d and/or c val at each end to show where it quits working), I found:  50d, 69, 88, 107b, 126bcd (and no secondary series since this always has c and/or d warts).
+I have not yet done any work to see what higher-limit extensions would go with Mildtone beyond clicking on the "11-limit" and "13-limit" buttons in x31eq to see what output it would yield; with "13-limit", it starts to come up with rather odd output, so I stopped there.
+Added:  [[User:Lucius Chiaraviglio|Lucius Chiaraviglio]] ([[User talk:Lucius Chiaraviglio|talk]]) 07:41, 27 May 2025 (UTC)