4edo: Difference between revisions

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We can also add more kinds of chords, for instance the subminor (1-7/6-3/2-5/3) and supermajor (1-9/7-3/2-9/5) to the mix, and by encoding which kind of tetrad a note reconstitute a version of 9-odd-limit tetradic harmony, again changing the harmonic content of a note without changing its 4edo skeletal position.

4edo can ne viewed as a [[dual-fifth]] system, with the tritone and major sixth as the flat and sharp "fifths". The major sixth in particular is one of the sharpest "fifths" of any EDO, only outmatched by that of [[1edo]], and even falling outside of the range of [[2L 1s]].

When viewed from a [[regular temperament]] perspective, 4edo can be seen as a tuning of the [[Dimipent family #Dimipent|dimipent temperament]], since it tempers [[648/625]] (the major diesis) by equating four minor thirds ([[6/5]]) to an octave. Alternately, it can be viewed as a critically flat [[hanson]] or [[myna]] scale, as both 6 and 10 generators reach the best approximation to the 5th. This interpretation works best if you stretch the octaves, 4edo is the first EDO that is [[The_Riemann_zeta_function_and_tuning#Zeta_EDO_lists|zeta peak but not zeta peak integer]], which means the point of maximum harmonicity is somewhat further away from pure octaves than the previous two EDOs. If you compress the octaves instead, it can be interpreted as critically sharp [[Chromatic_pairs#Gariberttet|Gariberttet]].

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 We can also add more kinds of chords, for instance the subminor (1-7/6-3/2-5/3) and supermajor (1-9/7-3/2-9/5) to the mix, and by encoding which kind of tetrad a note reconstitute a version of 9-odd-limit tetradic harmony, again changing the harmonic content of a note without changing its 4edo skeletal position.
+edo can ne viewed as a [[dual-fifth]] system, with the tritone and major sixth as the flat and sharp "fifths". The major sixth in particular is one of the sharpest "fifths" of any EDO, only outmatched by that of [[1edo]], and even falling outside of the range of [[2L 1s]].
 When viewed from a [[regular temperament]] perspective, 4edo can be seen as a tuning of the [[Dimipent family #Dimipent|dimipent temperament]], since it tempers [[648/625]] (the major diesis) by equating four minor thirds ([[6/5]]) to an octave. Alternately, it can be viewed as a critically flat [[hanson]] or [[myna]] scale, as both 6 and 10 generators reach the best approximation to the 5th. This interpretation works best if you stretch the octaves, 4edo is the first EDO that is [[The_Riemann_zeta_function_and_tuning#Zeta_EDO_lists|zeta peak but not zeta peak integer]], which means the point of maximum harmonicity is somewhat further away from pure octaves than the previous two EDOs. If you compress the octaves instead, it can be interpreted as critically sharp [[Chromatic_pairs#Gariberttet|Gariberttet]].

4edo: Difference between revisions

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