Sensamagic
Sensamagic is the rank-3 temperament tempering out 245/243, the sensamagic comma. It has a canonical 11-limit extension adding 385/384 and 896/891 to the comma list.
The temperament was named after the corresponding comma, which was named by Gene Ward Smith in 2010. See 245/243 #Etymology.
See Sensamagic family #Sensamagic for technical data.
Interval lattice
11-limit sensamagic
Notation
Sensamagic can be notated the same as 2.3.7 just intonation since they share the same lattice structure. One way to do this is to take the conventional circle-of-fifths notation with an additional module of accidentals for the 64/63 comma. In this system, 7/4 is a minor seventh, 5/4 an augmented second, and 11/8 a diminished fifth.
| Ratio | Nominal | Example |
|---|---|---|
| 3/2 | Perfect 5th | C-G |
| 5/4 | Double-up augmented 2nd | C-^^D# |
| 7/4 | Down minor 7th | C-vBb |
| 11/8 | Down diminished 5th | C-vGb |
Alternatively, it can be notated the same as full prime-limit just intonation, with a distinct accidental module for each prime harmonic. That makes some intervals more intuitive, at the cost of hiding the structure of sensamagic tempering. For example, it is customary of the 5/4 to be a major third, and 7/4 to be a minor seventh. As a result, the fact that the 5/3 is a stack of two 9/7's is not revealed, and the related chords can be less convenient.
Chords
Sensamagic enables essentially tempered chords of sensamagic, keenanismic, pentacircle, and undecimal sensamagic.
The sensamagic dominant chord is a dominant seventh chord useful for tonal harmony in this temperament.