Ammonite
From Xenharmonic Reference
(Redirected from Tridec)
Ammonite, 29 & 37, is a temperament generated by an accurate 13/10, such that
- 2 generators = 22/13
- 3 generators = 10/9~11/10~12/11 (hence Ammonite is a weak extension of 2.3.5.11 Porcupine)
- 4 generators = 10/7
- 9 generators = 4/3
Ammonite generates a very soft oneirotonic (5L3s) MOS with L ~= 11/10 and s ~= 14/13. It is most accurate as its 2.7/5.11/5.13/5 (or 2.(5:7:11:13)) restriction, which is technically called Tridec; Ammonite[8] provides 5:11:13 and 5:7:13 chords.
Interval chain
| # | Cents* | Approximate ratios |
|---|---|---|
| 0 | 0.0 | 1/1 |
| 1 | 454.2 | 13/10, 9/7 |
| 2 | 908.4 | 22/13 |
| 3 | 162.6 | 11/10, 12/11, 10/9 |
| 4 | 616.9 | 10/7 |
| 5 | 1071.1 | 13/7 |
| 6 | 325.3 | 6/5, 11/9 |
| 7 | 779.5 | 11/7 |
| 8 | 33.7 | 56/55 |
| 9 | 487.9 | 4/3 |
| 10 | 942.1 | 12/7 |
| 11 | 196.4 | 28/25 |
| 12 | 650.6 | 16/11 |
* In pure-13/10 tuning
Patent vals
- Main article: Ammonite/Patent vals
