Mutt: Difference between revisions
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'''Mutt''' is the [[regular temperament|temperament]] [[tempering out]] the [[horwell comma]] and the [[landscape comma]] in the 7-limit. [[Gene Ward Smith]] noted two remarkable properties of this temperament<ref>[https://yahootuninggroupsultimatebackup.github.io/tuning-math/topicId_12028.html#12037 Yahoo! Tuning Group | ''mutt microtemperament'']</ref>. In the [[5-limit]], the [[mutt comma]] reduces the lattice of pitch classes to three parallel strips of major thirds. The strips are three fifths (or three minor thirds, if you prefer) wide. In other words, tempering via mutt reduces the 5-limit to monzos of the form {{monzo| ''a'' ''b'' ''c'' }}, where ''b'' is -1, 0 or 1. In the 7-limit, the landscape comma 250047/250000 reduces the entire 7-limit to three layers of the 5-limit; everything in the 7-limit can be written {{monzo| ''a'' ''b'' ''c'' ''d'' }}, where ''d'' is -1, 0, or +1. Putting these facts together, we discover that mutt reduces the 7-limit to nine infinite chains of major thirds. In mutt, everything in the 7-limit can be written {{monzo| ''a'' ''b'' ''c'' ''d'' }}; where both ''b'' and ''d'' are in the range from -1 to 1, so that |''b''| ≤ 1 and |''d''| ≤ 1. | |||
The other remarkable property explains its name: it is supported by the standard val for [[768edo]]. Since dividing the octave into 768 = 12 × 64 parts is what some systems use for defining pitch (using the coarse, but not the fine, conceptual "pitch wheel" of [[MIDI]]), mutt is a temperament which accords to this kind of MIDI unit, hence the acronym "MIDI unit tempered tuning", or "mutt", as was named by [[Gene Ward Smith]] in 2004<ref>[https://yahootuninggroupsultimatebackup.github.io/tuning/topicId_53634.html#53850 Yahoo! Tuning Group | ''Retuning using midi to produce beatless music - You gotta be kidding!'']</ref>. | |||
generator | The fact that the smallest proper mos is 84 and the generator is about the 14-cent difference between the 400-cent third of equal temperament and a just third of 386 cents limits the applicability of mutt. If we tune 84 notes in 768edo to mutt, we divide 400 cents by a step of 9 repeated 27 times, followed by a step of 13. If we now use this to tune seven rows, each of which divides the octave into twelve parts, we have rows with the pattern [63 63 63 67 63 63 63 67 63 63 63 67], a modified version of [[12edo]]. | ||
See [[Horwell temperaments]] for technical data. | |||
== References == | |||
[[Category:Mutt| ]] <!-- main article --> | |||
[[Category:Rank-2 temperaments]] | |||
[[Category:Microtemperaments]] | |||
[[Category:Horwell temperaments]] | |||
[[Category:Landscape microtemperaments]] | |||
{{Todo| expand | improve readability }} | |||
Latest revision as of 14:31, 22 June 2026
Mutt is the temperament tempering out the horwell comma and the landscape comma in the 7-limit. Gene Ward Smith noted two remarkable properties of this temperament[1]. In the 5-limit, the mutt comma reduces the lattice of pitch classes to three parallel strips of major thirds. The strips are three fifths (or three minor thirds, if you prefer) wide. In other words, tempering via mutt reduces the 5-limit to monzos of the form [a b c⟩, where b is -1, 0 or 1. In the 7-limit, the landscape comma 250047/250000 reduces the entire 7-limit to three layers of the 5-limit; everything in the 7-limit can be written [a b c d⟩, where d is -1, 0, or +1. Putting these facts together, we discover that mutt reduces the 7-limit to nine infinite chains of major thirds. In mutt, everything in the 7-limit can be written [a b c d⟩; where both b and d are in the range from -1 to 1, so that |b| ≤ 1 and |d| ≤ 1.
The other remarkable property explains its name: it is supported by the standard val for 768edo. Since dividing the octave into 768 = 12 × 64 parts is what some systems use for defining pitch (using the coarse, but not the fine, conceptual "pitch wheel" of MIDI), mutt is a temperament which accords to this kind of MIDI unit, hence the acronym "MIDI unit tempered tuning", or "mutt", as was named by Gene Ward Smith in 2004[2].
The fact that the smallest proper mos is 84 and the generator is about the 14-cent difference between the 400-cent third of equal temperament and a just third of 386 cents limits the applicability of mutt. If we tune 84 notes in 768edo to mutt, we divide 400 cents by a step of 9 repeated 27 times, followed by a step of 13. If we now use this to tune seven rows, each of which divides the octave into twelve parts, we have rows with the pattern [63 63 63 67 63 63 63 67 63 63 63 67], a modified version of 12edo.
See Horwell temperaments for technical data.