Temperaments Of The Cantorum Duo Plus - Viscount Cantorum Duo Plus Reference Manual

Appendix
- 1/4 sc: a pure fifth narrowed by 1/4 of syntonic comma
- 1/4 pc: a pure fifth narrowed by 1/4 of pythagorean comma

Temperaments of the Cantorum Duo Plus

In addition to Equal temperament, with the Cantorum Duo Plus you can play other temperaments described below.
Kirnberger II
Based on two fifths, reduced by half syntonic comma, and
one fifth reduced by a skisma. There are three pure majors:
C, G, D. Therefore, the major triads on C and G are pure.
Same goes with the minor triads, on E and B. The four
major thirds on C#, G#, Eb, Bb are Pythagorean. The
coexistence of pure and tempered chords gives a peculiar
character to this tuning.
Werckmeister III
Based on four fifths, each reduced by ¼ Pythagorean
comma – the others are pure. Creates three Pythagorean
major thirds on: C#, F#, G#. As the number of alteration in
the piece performed increases, so does the harmonic
tension.
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Reference Manual