Viscount Cantorum Duo Mode D'emploi page 100

User Manual
WERCKMEISTER IV (WERCKMEIST.4 on display)
Based on five fiths, each reduced of 1/3 of Pythagorean
comma, and two more thirds increased of the same
amount. Very pleasant with mostly unaltered tonalities,
it becomes "harder" as the alterations increase.
WERCKMEISTER V (WERCKMEIST.5 on display)
Based on five fiths reduced by 1/5 of Pythagorean
comma, and one fifth increased of the same amount.
This tuning is rarely used as there is no tonality that is
much euphonic.
SILBERMANN
Based on fifths reduced of 1/6 of syntonic comma.
Wolf fifth is located on G#. Thirds that in meantone
tuning are pure, here are 1/3 syntonic comma wider.
The wolf fifth is less prominent, not cacophonic yet not
completely acceptable.
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