343edo: Difference between revisions

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{{Infobox ET}}
{{Infobox ET}}
{{EDO intro|343}}
{{ED intro}}


== Theory ==
== Theory ==
343edo is only [[consistent]] to the [[3-odd-limit]] since its errors of [[harmonic]]s [[3/1|3]] and [[5/1|5]] are quite large. To start with, consider the 2.9.15.7 [[subgroup]], where it [[tempering out|tempers out]] 5250987/5242880. In the 2.5.7 subgroup it tempers out 2100875/2097152 and in the 2.3.7 subgroup it tempers out 118098/117649.  
343edo is only [[consistent]] to the [[3-odd-limit]] since its errors of [[harmonic]]s [[3/1|3]] and [[5/1|5]] are quite large. To start with, consider the 2.9.15.7 [[subgroup]], where it [[tempering out|tempers out]] 5250987/5242880. In the 2.5.7 subgroup it tempers out 2100875/2097152 and in the 2.3.7 subgroup it tempers out 118098/117649.  


For the full 7-limit, the 343c [[val]] tempers out [[4375/4374]] and [[5120/5103]], [[support]]ing [[amity]]. The 343cdd val tempers out [[16875/16807]] and 65536/64827. The [[patent val]] tempers out [[10976/10935]] and 390625/387072.  
For the full 7-limit, the 343c [[val]] tempers out [[4375/4374]] and [[5120/5103]], [[support]]ing [[amity]] (gen. 97\343, per. 343\343). The 343cdd val tempers out [[16875/16807]] and 65536/64827. The [[patent val]] tempers out [[10976/10935]] and 390625/387072.


=== Odd harmonics ===
=== Odd harmonics ===
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=== Subsets and supersets ===
=== Subsets and supersets ===
Since 343 factors into 7<sup>3</sup>, 343edo has [[7edo]] and [[49edo]] as its subsets. [[686edo]], which doubles it, gives a good correction to the harmonics 3 and 5.
Since 343 factors into 7<sup>3</sup>, 343edo has [[7edo]] and [[49edo]] as its subsets. [[686edo]], which doubles it, gives a good correction to the harmonics 3 and 5.
== Use as a NEJI ==
Of all n-[[afdo]]s where n is between 343 and 800, and where n is a multiple of a simple prime by any number of 2s, or a simple semiprime by any number of 2s, [[476afdo]] (''7x17x2x2'') approximates 343edo with the least [[relative error]]. (''See [[User:BudjarnLambeth/Approximating 343edo in afdos|Approximating 343edo in afdos]].)''
343edo could be approximated into 476afdo as a [[neji]] scale. Doing so would make it an over-17-by-7 scale (when viewed through a [[primodal]] lens).  (''[[User:BudjarnLambeth/Approximating 343edo in afdos#Scala file|Scala file]].)''
It would make sense to use smaller over-17, over-7, or over-17-by-7 JI scales as subsets of this neji.


== Regular temperament properties ==
== Regular temperament properties ==
343edo is on the [[optimal ET sequence]] of [[gammy]] temperament (343be, 10\343 generator, 2/1 period), [[protolangwidge]] temperament (343, 200\343 g, 2/1 p) and [[anthoine]] temperament (343dd, 110\343 g, 2/1 p).
343edo might potentially be useful for [[49th-octave temperaments]] ''(see [[Fractional-octave temperaments]])'', this is something which hasn't been explored yet.
{| class="wikitable center-4 center-5 center-6"
{| class="wikitable center-4 center-5 center-6"
|-
! rowspan="2" | [[Subgroup]]
! rowspan="2" | [[Subgroup]]
! rowspan="2" | [[Comma list|Comma List]]
! rowspan="2" | [[Comma list]]
! rowspan="2" | [[Mapping]]
! rowspan="2" | [[Mapping]]
! rowspan="2" | Optimal<br>8ve Stretch (¢)
! rowspan="2" | Optimal<br />8ve stretch (¢)
! colspan="2" | Tuning Error
! colspan="2" | Tuning error
|-
|-
! [[TE error|Absolute]] (¢)
! [[TE error|Absolute]] (¢)
! [[TE simple badness|Relative]] (%)
! [[TE simple badness|Relative]] (%)
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| {{monzo| -1087 343 }}
| {{monzo| -1087 343 }}
| {{mapping| 343 1087 }}
| {{mapping| 343 1087 }}
| 0.1569
| +0.1569
| 0.1569
| 0.1569
| 4.48
| 4.48
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| {{monzo| -27 -1 13 }}, {{monzo| 40 -28 21 }}
| {{monzo| -27 -1 13 }}, {{monzo| 40 -28 21 }}
| {{mapping| 343 1087 796 }}
| {{mapping| 343 1087 796 }}
| 0.3162
| +0.3162
| 0.2592
| 0.2592
| 7.41
| 7.41
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| 118098/117649, 7381125/7340032, 9765625/9680832
| 118098/117649, 7381125/7340032, 9765625/9680832
| {{mapping| 343 1087 796 963 }}
| {{mapping| 343 1087 796 963 }}
| 0.2130
| +0.2130
| 0.2869
| 0.2869
| 8.20
| 8.20
|}
|}
== Octave stretch or compression ==
If one is using 343edo, it's probably either for a specific temperament, or because of its good [[prime]]s 2, 7, 17 and 19, which will inform how one might want to [[octave stretch]] or compress it.
; Using for a temperament
[[TE]] octave stretch:
* For 13-limit gammy
** Octave size: 1200.437{{c}}
* For 7-limit anthoine
** Octave size: 1199.630{{c}}
; Using for primes 2, 7, 17, 19
If one is using 343 for its accurate 2.7.17.19 intervals, one will probably not want to use 343edo with [[wart]]s a, d, g or h.
That leaves the following [[TE]] tunings for the [[19-limit]]:
* 343cf
** Octave size: 1199.643{{c}}
** TE error: 0.363{{c}}/octave
* 343c
** Octave size: 1199.761{{c}}
** TE error: 0.382{{c}}/octave
* 343 (patent val)
** Octave size: 1199.950{{c}}
** TE error: 0.395{{c}}/octave
* 343e
** Octave size: 1200.076{{c}}
** TE error: 0.418{{c}}/octave
* 343f
** Octave size: 1199.831{{c}}
** TE error: 0.431{{c}}/octave
* 343ce
** Octave size: 1199.888{{c}}
** TE error: 0.461{{c}}/octave
{{Harmonics in cet|3.498|intervals=odd|title=Odd harmonics in TE-tuned 343cf}}
== Scales ==
343edo includes every 49edo scale (see [[49edo#Scales]]).
==== Lucite[23] ====
'''Lucite[23]''' is a 23-tone [[MOS scale]] discovered by [[Gordon Wery]] in October 2025:
* 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13
; Properties
It is very similar to [[23edo]] and can be used as a [[well temperament]] of 23edo.
In his post on Discord describing it, Wery said of the scale:
"''Basically a more complicated version of 23edo, centered around a more minor (less neutral) anti-diatonic scale.''
''This scale has a sort of glassy quality, ample neutral seconds, and two sets of dual fifths--a true dual dual fifth scale.''"
It is [[generator|generated]] by 30\343 (104.956{{c}}).
Lucite[23] can be generalised into a 17-limit [[regular temperament]] called '''[[User:BudjarnLambeth/Regular temperament interpretation of lucite23|lucite temperament]]'''.
; Naming
Lucite is another name for acrylic glass.
Wery named the temperament "lucite" because musically, it sounds like frosted glass (perhaps to do with the timbre/partials of struck glass).
Some coincidences that make the name "lucite" particularly fitting
* Lucite is often installed in double layers in building, and lucite temperament has two sizes of perfect fifth-like interval.
* Lucite[23] is close to ripple[23], but turned inside out; and lucite is reflective and clear like water, but solid instead of liquid
* Lucite is an especially lightweight material, and lucite temperament is lightweight in the way it only needs 18 generators to reach every 17-limit prime.
; Subsets
* [[Modmos]] of lucite[6]: 60 60 30 40 93 60
=== Other MOS scales ===
* Amity[7]: 52 52 45 52 45 52 45
* Amity[11]: 45 7 45 45 7 45 7 45 45 7 42
* Amity[18]: 7 38 7 38 7 7 38 7 7 38 7 38 7 7 38 7 38 7
* Amity[25]: 7 31 7 7 7 31 7 7 31 7 7 7 31 7 7 7 31 7 7 31 7 7 7 31 7
* Amity[32]: 7 7 24 7 7 7 24 7 7 7 7 24 7 7 7 24 7 7 7 7 24 7 7 7 24 7 7 7 7 24 7 7
* Amity[39]: 7 7 17 7 7 7 7 7 17 7 7 7 7 17 7 7 7 7 7 17 7 7 7 7 7 17 7 7 7 7 17 7 7 7 7 7 17 7 7
* Amity[53]: 7 7 7 3 7 7 7 7 7 7 7 3 7 7 7 7 7 7 3 7 7 7 7 7 7 7 3 7 7 7 7 7 7 7 3 7 7 7 7 7 7 3 7 7 7 7 7 7 7 3 7 7 7
** ''Try approximating scales fron 53edo ([[53edo#Scales]]) within the amity[53] scale''
* Amity[99]: 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 3 4 3 4 3 4 3 4 3 4 3 4 3 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 3 4 3 4 3 4 3 4 3 4 3 4 3 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 3 4 3 4 3 4 3 4 3 4 3 4 3 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3
** ''Try approximating scales fron 99edo ([[99edo#Scales]]) within the amity[99] scale''
* Lucite[23]: 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13 17 13
** ''Try approximating scales fron 23edo ([[23edo#Scales]]) within the lucite[23] scale''
* Lucite[34]: 13 4 13 13 4 13 13 4 13 13 4 13 13 13 4 13 13 4 13 13 4 13 13 4 13 13 4 13 13 4 13 13 4 13
** ''Try approximating scales fron 34edo ([[34edo#Scales]]) within the lucite[34] scale''
=== 343ed16 ===
'''343ed16''' is contained within 343edo (it is every 4th step of 343edo). It is like [[86edo]] with the [[octave stretching|octave stretched]] by 3.5 [[cents]].
It is quite similar to [[136edt]].
Compared to 86edo it improves harmonics 3, 5, 7 and 11. Its mappings of multiple-of-2 harmonics are very inconsistent, though some composers may enjoy this due to the potential to play tricks on the listener by having [[octave equivalence]] fall on a scale step one might not expect.
Many temperaments and scales from 86edo can be used here in 343ed16 too.
{{Harmonics in equal|343|16|1|intervals=integer|columns=12}}
{{Harmonics in equal|86|2|1|intervals=integer|columns=12|collapsed=1|title=86edo for comparison}}
=== 34.3edo ===
'''34.3edo''' is contained within 343edo (it is every 10th step of 343edo). It is like [[34edo]] with the [[octave shrinking|octave compressed]] by 11.51 [[cents]].
It has a step size of 34.985{{c}}.
It was discovered by chaseofspades513 and [[YoVariable]] on the [[Xenharmonic Alliance]] Discord server and further described by [[Gordon Wery]].
Compared to 34edo it improves harmonics 7, 11 and 13, at the expense of 2, 3 and 5. Its mappings of multiple-of-2 and multiple-of-3 harmonics are very inconsistent, though some composers may enjoy this due to the potential to play tricks on the listener by having [[octave equivalence]] fall on a scale step one might not expect.
Many temperaments and [[34edo#Scales|scales from 34edo]] can be used here in 34.3edo too.
{{Harmonics in cet|34.985|intervals=integer|columns=12|title=Approximation of harmonics in 34.3edo}}
{{Harmonics in equal|34|2|1|intervals=integer|columns=12|collapsed=1|title=34edo for comparison}}
=== Scales approximated from JI ===
* [[4 of 7-17-19-21-51 pentany]]: 96 50 55 96 46 (sounds like minor pentatonic)
* [[4 of 7-17-19-21-51 by 3/2 tetrapentany]]: 3 9 46 4 34 21 29 8 47 3 9 46 38 46
* [[7-17-19-21 hexany]]: 50 46 50 55 87 55 (sounds like minor hexatonic)
* [[7-17-19-21 by 3/2 trihexany]]: 3 47 8 38 12 38 8 47 3 46 9 29 9 46
* [[9afdo]]: 40 37 34 32 30 28 52 47 43
* [[18afdo]]: 21 19 19 18 17 17 16 16 15 15 14 14 27 25 24 23 22 21
* [[36afdo]]: 11 10 9 10 9 10 9 9 8 9 8 9 8 8 8 8 7 8 7 8 7 7 7 7 14 13 13 12 12 12 12 11 11 11 11 10
* [[72afdo]]: 5 6 5 5 4 5 5 5 5 4 5 5 4 5 4 5 4 4 5 4 4 4 5 4 4 4 4 4 4 4 4 4 4 3 4 4 4 3 4 4 3 4 4 3 4 3 4 3 7 7 6 7 6 7 6 6 6 6 6 6 6 6 6 5 6 5 6 5 6 5 5 5
=== Other scales ===
* [[Equiheptatonic]] (as from [[7edo]]): 49 49 49 49 49 49 49
* [[49edo]]: 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
== Music ==
; [[Budjarn Lambeth]]
* [https://youtu.be/aWqdWHSk5J4 ''Odd Findings in the Caves''] (2025) - ''uses two copies of lucite[23]''