Viscount Cantorum Duo Mode D'emploi page 98

User Manual
MEANTONE 3# - MEANTONE 3b
This tuning is the prototype of all temperaments based on fifths reduced by ¼ of syntonic comma.
This generates eight pure major thirds: Eb, Bb, F, C, G, D, A, E. However, the other thirds are unsuable
(B, F#, G#). The fifths are defined as meantone fifths: shorter than pure fifths but still sounding well.
Only one, G#, fills all the gap created by 11 others and becomes a wolf fifth. Tonalities with little
alterations sound very pleasant. Well characterised chromatic scale. Move the wolf on C# to use the G#
key as Ab.
VALLOTTI
Based on six fifths, each decreased by 1/6 of
Pythagorean comma. The others are pure fifths.
The major thirds on Eb–B, Bb–E, F–A are equivalent,
as the ones on C, G and D. Thirds on F#, C# and G#
are Pythagorean instead.
EN - 42