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The '''trienstonic clan''' of temperaments tempers out [[28/27]], the septimal third-tone or trienstonic comma.  
{{Technical data page}}
The '''trienstonic clan''' of [[rank-2 temperament|rank-2]] [[temperament]]s are low-complexity, high-error temperaments that [[tempering out|temper out]] [[28/27]], the septimal third-tone or trienstonic comma. This equates very different intervals with each other; in particular, [[9/8]] with [[7/6]], [[8/7]] with [[32/27]], and [[4/3]] with [[9/7]]. Trienstonian is close to the edge of what can be sensibly called a temperament at all; in other words, it is an [[exotemperament]].


Adding 16/15 to 28/27 leads to father temperament, adding 256/245 gives uncle, adding 50/49 gives octokaidecal and adding 126/125 gives opossum. Other members of the clan discussed elsewhere are [[Dicot family #Sharp|sharp]], [[Archytas clan #Blacksmith|blacksmith]], and [[Meantone family #Sharptone|sharptone]].  
== Trienstonian ==
This low-accuracy temperament is generated by a fifth, tuned very sharp such that a stack of three reach a ~7/4. [[5edo]] is the tuning that conflates 7/6~9/8 (+2 generator steps) with ~8/7 (-3 generator steps). If you do not care about the intervals of 9 in this temperament, you can tune the fifth sharper for the [[7-odd-limit]], leading to an [[5L 3s|oneirotonic]] scale or otherwise a [[5L 2s|diatonic]] scale with negative small steps. A tuning that prioritizes the 7-odd-limit also tunes the fifth sharper than the [[pentic]] range, instead generating an [[antipentic]] scale. Trienstonian can be considered the [[2.3.7 subgroup|2.3.7]] analog of [[mavila]] temperament, with extremely sharp fifths rather than extremely flat ones, being on the other side of 3\5 from [[archy]] fifths, just like how mavila fifths are on the other side of 4\7 from [[meantone]] fifths.


= Father =
[[Subgroup]]: 2.3.7
{{see also| Father family #Father }}


Comma list: 16/15, 28/27
[[Comma list]]: 28/27


[[POTE generator]]: ~3/2 = 742.002
{{Mapping|legend=2| 1 0 -2 | 0 1 3 }}


Mapping: [{{val| 1 0 4 -2 }}, {{val| 0 1 -1 3 }}]
{{Mapping|legend=3| 1 0 0 -2 | 0 1 0 3 }}
: mapping generators: ~2, ~3


Wedgie: {{wedgie| 1 -1 3 -4 2 10 }}
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1196.254{{c}}, ~3/2 = 719.306{{c}}
: [[error map]]: {{val| -3.746 +13.604 -14.655 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 719.606{{c}}
: error map: {{val| 0.000 +17.651 -10.007 }}


Minimax tuning:
{{Optimal ET sequence|legend=1| 2d, 3d, 5 }}
* 7-odd-limit
: [{{monzo| 1 0 0 0 }}, {{monzo| 3/2 0 -1/4 1/4 }}, {{monzo| 5/2 0 1/4 -1/4 }}, {{monzo| 5/2 0 -3/4 3/4 }}]
: [[Eigenmonzo subgroup]]: 2.7/5
* 9-odd-limit
: Eigenmonzo subgroup: 2.9/5


{{Val list|legend=1| 2d, 3d, 5, 8d, 13cd, 21bccdd }}
[[Badness]] (Sintel): 0.235


Badness: 0.0213
=== Overview to extensions ===
Adding 16/15 to 28/27 leads to father, 21/20 gives sharptone, 256/245 gives uncle, and 35/32 gives wallaby. These all use the same generators as trienstonian.  


= Uncle =
50/49 gives octokaidecal with a semi-octave period. 25/24 gives sharpie; 27/25 gives mite. Those split the generator in two. 1029/1000 gives parakangaroo; 126/125 gives opossum. Those split the generator in three. 128/125 gives inflated with a 1/3-octave period. Finally, 49/48 gives blackwood, with a 1/5-octave period.
Comma list: 28/27, 256/245


Mapping: [{{val| 1 0 12 -2 }}, {{val| 0 1 -6 3 }}]
Members of the clan discussed elsewhere are:  


Wedgie: {{wedgie| 1 -6 3 -12 2 24 }}
* [[Antonian]] (+10/9 or +15/14) → [[Very low accuracy temperaments #Septimal antonian|Very low accuracy temperaments]]
* [[Father]] (+16/15) → [[Father family #Septimal father|Father family]]
* ''[[Sharptone]]'' (+21/20) → [[Meantone family #Sharptone|Meantone family]]
* ''[[Sharpie]]'' (+25/24) → [[Dicot family #Sharpie|Dicot family]]
* ''[[Mite]]'' (+27/25) → [[Bug family #Mite|Bug family]]
* ''[[Wallaby]]'' (+35/32) → [[Very low accuracy temperaments #Wallaby|Very low accuracy temperaments]]
* [[Blackwood]] (+49/48) → [[Limmic temperaments #Blackwood|Limmic temperaments]]
* ''[[Opossum]]'' (+126/125) → [[Porcupine family #Opossum|Porcupine family]]
* ''[[Inflated]]'' (+128/125) → [[Augmented family #Inflated|Augmented family]]


Minimax tuning:
Considered below are uncle, octokaidecal, and parakangaroo.
* 7-odd-limit eigenmonzo subgroup: 2.5/3
* 9-odd-limit eigenmonzo subgroup: 2.9/5


{{Val list|legend=1| 13d, 18, 23bc, 41bcd }}
== Uncle ==
: ''For the 5-limit version, see [[Syntonic–diatonic equivalence continuum #Uncle (5-limit)]].''


Badness: 0.0727
Uncle tempers out 256/245, mapping the interval class of 5 to -6 generator steps, as a major 2-step in oneirotonic or a diminished fifth in diatonic.  


= Octokaidecal =
[[Subgroup]]: 2.3.5.7
Comma list: 28/27, 50/49


[[POTE generator]]: ~3/2 = 728.874
[[Comma list]]: 28/27, 256/245


Mapping: [{{val| 2 0 -5 -4 }}, {{val| 0 1 3 3 }}]
{{Mapping|legend=1| 1 0 12 -2 | 0 1 -6 3 }}


Wedgie: {{wedgie| 2 6 6 5 4 -2 }}
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1190.224{{c}}, ~3/2 = 725.221{{c}}
: [[error map]]: {{val| -9.776 +13.490 +3.707 -2.939 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 731.394{{c}}
: error map: {{val| 0.000 +29.439 +25.324 +25.355 }}


Minimax tuning:  
[[Minimax tuning]]:  
* 7-odd-limit eigenmonzo subgroup: 2.5
* [[7-odd-limit]] [[eigenmonzo basis|unchanged-interval (eigenmonzo) basis]]: 2.5/3
* 9-odd-limit eigenmonzo subgroup: 2.5
* [[9-odd-limit]] [[eigenmonzo basis|unchanged-interval (eigenmonzo) basis]]: 2.9/5


{{Val list|legend=1| 10, 18, 28b }}
{{Optimal ET sequence|legend=1| 5, 13d, 18, 23bc, 41bbcd }}


Badness: 0.0367
[[Badness]] (Sintel): 1.84


== 11-limit ==
== Octokaidecal ==
Comma list: 28/27, 50/49, 55/54
: ''For the 5-limit version, see [[Miscellaneous 5-limit temperaments #Supersharp]].''
Octokaidecal extends trienstonian by tempering out [[50/49]], thus splitting the octave in half. It generates the [[8L 2s]] (taric) mos scale, with tunings on the other side of [[10edo]] as [[2L 8s]] (jaric). Compared to [[pajara]], decatonic thirds ([[8/7]] and [[7/6]]) and fourths ([[6/5]] and [[5/4]]) have their mappings reversed, meaning octokaidecal can be considered what is to pajara as [[mavila]] is to [[meantone]].


POTE generator: ~3/2 = 732.330
[[Subgroup]]: 2.3.5.7


Mapping: [{{val| 2 0 -5 -4 7 }}, {{val| 0 1 3 3 0 }}]
[[Comma list]]: 28/27, 50/49


{{Val list|legend=1| 10, 18e }}
{{Mapping|legend=1| 2 0 -5 -4 | 0 1 3 3 }}


Badness: 0.0302
[[Optimal tuning]]s:
* [[WE]]: ~7/5 = 596.984{{c}}, ~3/2 = 725.210{{c}} (~15/14 = 128.226{{c}})
: [[error map]]: {{val| -6.031 +17.224 -13.699 +0.774 }}
* [[CWE]]: ~7/5 = 600.000{{c}}, ~3/2 = 726.319{{c}} (~15/14 = 126.319{{c}})
: error map: {{val| 0.000 +24.364 -7.358 +10.130 }}


= Opossum =
[[Minimax tuning]]:
Comma list: 28/27, 126/125
* [[7-odd-limit|7-]] and [[9-odd-limit]] [[eigenmonzo basis|unchanged-interval (eigenmonzo) basis]]: 2.5


[[POTE generator]]: ~10/9 = 159.691
{{Optimal ET sequence|legend=1| 8d, 10, 18, 28b }}


Mapping: [{{val| 1 2 3 4 }}, {{val| 0 -3 -5 -9 }}]
[[Badness]] (Sintel): 0.930


Wedgie: {{wedgie| 3 5 9 1 6 7 }}
=== 11-limit ===
Subgroup: 2.3.5.7.11


Minimax tuning:
Comma list: 28/27, 50/49, 55/54
* 7-odd-limit eigenmonzo subgroup: 2.7
* 9-odd-limit eigenmonzo subgroup: 2.7
 
{{Val list|legend=1| 7d, 8d, 15 }}
 
Badness: 0.0407
 
== 11-limit ==
Comma list: 28/27, 55/54, 77/75
 
[[POTE generator]]: ~10/9 = 159.807
 
Mapping: [{{val| 1 2 3 4 4 }}, {{val| 0 -3 -5 -9 -4 }}]
 
Minimax tuning: 11-odd-limit eigenmonzo subgroup: 2.7
 
{{Val list|legend=1| 7d, 8d, 15 }}
 
Badness: 0.0223


== 13-limit ==
Mapping: {{mapping| 2 0 -5 -4 7 | 0 1 3 3 0 }}
Comma list: 28/27, 40/39, 55/54, 66/65


[[POTE generator]]: ~10/9 = 158.805
Optimal tunings:
* WE: ~7/5 = 595.139{{c}}, ~3/2 = 726.397{{c}} (~15/14 = 131.258{{c}})
* CWE: ~7/5 = 600.000{{c}}, ~3/2 = 729.485{{c}} (~15/14 = 129.485{{c}})


Mapping: [{{val| 1 2 3 4 4 4 }}, {{val| 0 -3 -5 -9 -4 -2 }}]
{{Optimal ET sequence|legend=0| 8d, 10, 18e }}


Minimax tuning:  
Badness (Sintel): 1.00
* 13-odd-limit eigenmonzo subgroup: 2.7
* 15-odd-limit eigenmonzo subgroup: 2.7


{{Val list|legend=1| 7d, 8d, 15, 38bcef }}
== Parakangaroo ==
: ''For the 5-limit version, see [[Miscellaneous 5-limit temperaments #Kangaroo]].''


Badness: 0.0194
This temperament used to be known as ''kangaroo'', but was decanonicalized in 2024 in favor of a more accurate extension. It splits the perfect twelfth into three generators of ~10/7; its ploidacot is alpha-tricot. [[15edo]] shows us an obvious tuning.  


= Wallaby =
[[Subgroup]]: 2.3.5.7
Comma list: 28/27, 35/32


POTE generator: ~3/2 = 691.351
[[Comma list]]: 28/27, 1029/1000


Mapping: [{{val| 1 0 7 -2 }}, {{val| 0 1 -3 3 }}]
{{Mapping|legend=1| 1 0 -3 -2 | 0 3 10 9 }}


Wedgie: {{wedgie| 1 -3 3 -7 2 15 }}
: mapping generators: ~2, ~10/7


{{Val list|legend=1| 2d, 5c, 19ccdd }}
[[Optimal tuning]]s:
* [[WE]]: ~2 = 596.984{{c}}, ~10/7 = 638.135{{c}}
: [[error map]]: {{val| -2.883 +12.450 +3.685 -19.845 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~10/7 = 639.302{{c}}
: error map: {{val| 0.000 +15.952 +6.710 -15.104 }}


Badness: 0.0585
{{Optimal ET sequence|legend=1| 2cd, …, 13cd, 15 }}


= Kangaroo =
[[Badness]] (Sintel): 1.97
== 5-limit ==
Comma list: 64000/59049


POTE generator: ~27/20 = 561.195
=== 11-limit ===
Subgroup: 2.3.5.7.11


Mapping: [{{val| 1 0 -3 }}, {{val| 0 3 10 }}]
{{Val list|legend=1| 15, 47b, 62b }}
Badness: 0.2958
== 7-limit ==
Comma list: 28/27, 1029/1000
POTE generator: ~7/5 = 560.328
Mapping: [{{val| 1 0 -3 -2 }}, {{val| 0 3 10 9 }}]
Wedgie: {{wedgie| 3 10 9 9 6 -7 }}
{{Val list|legend=1| 15 }}
Badness: 0.0779
== 11-limit ==
Comma list: 28/27, 77/75, 245/242
Comma list: 28/27, 77/75, 245/242


POTE generator: ~7/5 = 560.155
Mapping: {{mapping| 1 0 -3 -2 -4 | 0 3 10 9 14 }}
 
Mapping: [{{val| 1 0 -3 -2 -4 }}, {{val| 0 3 10 9 14 }}]
 
{{Val list|legend=1| 15 }}
 
Badness: 0.0432
 
== 13-limit ==
Comma list: 28/27, 40/39, 77/75, 147/143


POTE generator: ~7/5 = 559.770
Optimal tunings:  
* WE: ~2 = 1196.971{{c}}, ~10/7 = 638.230{{c}}
* CWE: ~2 = 1200.000{{c}}, ~10/7 = 639.480{{c}}


Mapping: [{{val| 1 0 -3 -2 -4 0 }}, {{val| 0 3 10 9 14 7 }}]
{{Optimal ET sequence|legend=0| 15 }}


{{Val list|legend=1| 15 }}
Badness (Sintel): 1.43


Badness: 0.0327
=== 13-limit ===
Subgroup: 2.3.5.7.11.13


= Quindecic =
Comma list: 28/27, 40/39, 66/65, 147/143
Comma list: 28/27, 49/48, 55/54, 77/75


POTE generator: ~13/8 = 852.924
Mapping: {{mapping| 1 0 -3 -2 -4 0 | 0 3 10 9 14 7 }}


Mapping: [{{val| 15 24 35 42 52 0 }}, {{val| 0 0 0 0 0 1 }}]
Optimal tunings:  
* WE: ~2 = 1194.720{{c}}, ~10/7 = 637.413{{c}}
* CWE: ~2 = 1200.000{{c}}, ~10/7 = 639.609{{c}}


{{Val list|legend=1| 15, 30, 45bc }}
{{Optimal ET sequence|legend=0| 15 }}


Badness: 0.0289
Badness (Sintel): 1.35


[[Category:Theory]]
[[Category:Temperament clans]]
[[Category:Temperament clan]]
[[Category:Trienstonic clan| ]] <!-- main article -->
[[Category:Trienstonic]]
[[Category:Rank 2]]
[[Category:Rank 2]]
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