12 WT (d'Alembert-Rousseau)

For a general introduction to European historical tunings and these presets, please visit Introduction to European historical tunings and temperaments.

About this tuning

12-tone well temperament d'Alembert-Rousseau (1752). Four fifthsPitches a fifth apart have a 2:3 frequency ratio (in just intonation) or a difference of 700 cents (in 12 tone equal temperament).Visit the link to learn more are each narrowed by 1/4 of a quintal (Syntonic) commaA comma is a small difference in pitch between the same interval in different tuning systems.Visit the link to learn more: C-G, G-D, D-A, A-E. Four fifths are each narrowed by 1/12 of a tertial comma (plus 1/4 schisma to compensate for the quarter-comma meantone fifths): E-B, B-F♯, F♯-C♯, C♯-G♯. The remaining four fifths are tuned 1/12 tertial comma larger than 2:3.

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