18L 9s
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| Pattern | LLs LLs LLs LLs LLs LLs LLs LLs LLs | |
| Period | 1\9 | |
| Generator range | 1\27 (44.4¢) to 1\18 (66.7¢) | |
| Parent MOS | 9L 9s | |
| Daughter MOSes | 27L 18s, 18L 27s | |
| Sister MOS | 9L 18s | |
| Neutralized MOS | 9L 18s | |
| TAMNAMS name | ennealimmal albitonic | |
| Equal tunings | ||
| Supersoft (L:s = 4:3) | 4\99 (48.5¢) | |
| Soft (L:s = 3:2) | 3\72 (50.0¢) | |
| Semisoft (L:s = 5:3) | 5\117 (51.3¢) | |
| Basic (L:s = 2:1) | 2\45 (53.3¢) | |
| Semihard (L:s = 5:2) | 5\108 (55.6¢) | |
| Hard (L:s = 3:1) | 3\63 (57.1¢) | |
| Superhard (L:s = 4:1) | 4\81 (59.3¢) | |
This is the MOS with 9 periods of 2L 1s. Its generator is not less than a "pure" diesis or "neutral" quartertone of 1/27edo (44.444 cents) nor greater than a chromatic semitone of 1/18edo (66.667 cents).
| 1/18 | 66.667 | |||||
| 6/117 | 61.5385 | |||||
| 5/99 | 60.606 | |||||
| 4/81 | 59.259 | |||||
| 7/144 | 58.333 | |||||
| 57.513 | ||||||
| 3/63 | 57.143 | |||||
| 56.309 | ||||||
| 8/171 | 56.14 | |||||
| 55.976 | ||||||
| 5/108 | 55.556 | |||||
| 7/153 | 55.098 | |||||
| 9/198 | 54.5455 | |||||
| 2/45 | 53.333 | |||||
| 9/207 | 52.174 | |||||
| 7/162 | 51.852 | |||||
| 51.733 | ||||||
| 5/117 | 51.282 | |||||
| 50.929 | ||||||
| 8/189 | 50.794 | |||||
| 50.57 | ||||||
| 3/72 | 50 | |||||
| 7/171 | 49.123 | |||||
| 4/99 | 48.121 | |||||
| 5/126 | 47.619 | |||||
| 6/153 | 47.058 | |||||
| 1/27 | 44.444 |