21wtn
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A 21 tone well tempered nonet (21WTN) is related to well temperaments of 18edo, but with a nonet rather than the 2/1 being constant.
Patent Intervals
| 1 | 66.667 |
| 2 | 133.333 |
| 3 | 200.000 |
| 4 | 266.667 |
| 5 | 333.333 |
| 6 | 400.000 |
| 7 | 466.667 |
| 8 | 533.333 |
| 9 | 600.000 |
| 10 | 666.667 |
| 11 | 733.333 |
| 12 | 800.000 |
| 13 | 866.667 |
| 14 | 933.333 |
| 15 | 1000.000 |
| 16 | 1066.667 |
| 17 | 1133.333 |
| 18 | 1200.000 |
| 19 | 1267.97 |
| 20 | 1333.94 |
| 21 | 1403.91 |