9edf
| ← 8edf | 9edf | 10edf → |
9edf is the equal division of the just perfect fifth into 9 parts of 78 cents each, corresponding to 15.391524edo. It is nearly identical to Carlos Alpha.
Approximation of harmonics
| Harmonic | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Error | absolute (¢) | -30.1 | -30.1 | +17.8 | +21.5 | +17.8 | -15.0 | -12.2 | +17.8 | -8.6 | -17.6 | -12.2 | +5.2 | +32.9 | -8.6 | +35.7 | +8.7 | -12.2 | -27.8 |
| relative (%) | -39 | -39 | +23 | +28 | +23 | -19 | -16 | +23 | -11 | -23 | -16 | +7 | +42 | -11 | +46 | +11 | -16 | -36 | |
| Steps (reduced) |
15 (6) |
24 (6) |
31 (4) |
36 (0) |
40 (4) |
43 (7) |
46 (1) |
49 (4) |
51 (6) |
53 (8) |
55 (1) |
57 (3) |
59 (5) |
60 (6) |
62 (8) |
63 (0) |
64 (1) |
65 (2) | |
Intervals
| # | Cents | Approximate ratios | Neptunian notation using 7\9edf |
|---|---|---|---|
| 0 | 0.0 | 1/1 | C |
| 1 | 78.0 | 25/24, 21/20 | C# |
| 2 | 156.0 | 12/11, 11/10 | Db |
| 3 | 234.0 | 8/7 | D |
| 4 | 312.0 | 6/5 | D#, Eb |
| 5 | 390.0 | 5/4 | E |
| 6 | 468.0 | 21/16 | E#, Fb |
| 7 | 546.0 | 15/11, 11/8 | F |
| 8 | 624.0 | 10/7, 36/25 | F#, Cb |
| 9 | 702.0 | 3/2 | C |
Scale tree
EDF scales can be approximated in EDOs by subdividing diatonic fifths. If 4\7 (four degrees of 7EDO) is at one extreme and 3\5 (three degrees of 5EDO) is at the other, all other possible 5L 2s scales exist in a continuum between them. You can chop this continuum up by taking "freshman sums" of the two edges - adding together the numerators, then adding together the denominators (i.e. adding them together as if you would be adding the complex numbers analogous real and imaginary parts). Thus, between 4\7 and 3\5 you have (4+3)\(7+5) = 7\12, seven degrees of 12EDO.
If we carry this freshman-summing out a little further, new, larger EDOs pop up in our continuum.
Generator range: 76.1905 cents (4\7/9 = 4\63) to 80 cents (3\5/9 = 1\15)
| Fifth | Cents | Comments | ||||||
|---|---|---|---|---|---|---|---|---|
| 4\7 | 76.1905 | |||||||
| 27\47 | 76.596 | |||||||
| 23\40 | 76.6 | |||||||
| 42\73 | 76.712 | |||||||
| 19\33 | 76.76 | |||||||
| 53\92 | 76.812 | |||||||
| 34\59 | 76.836 | |||||||
| 49\85 | 76.893 | |||||||
| 15\26 | 76.932 | |||||||
| 56\97 | 76.976 | |||||||
| 41\71 | 76.995 | |||||||
| 67\116 | 77.0115 | |||||||
| 26\45 | 77.037 | Flattone is in this region | ||||||
| 63\109 | 77.064 | |||||||
| 37\64 | 77.083 | |||||||
| 48\83 | 77.108 | |||||||
| 11\19 | 77.193 | |||||||
| 51\88 | 77.27 | |||||||
| 40\69 | 77.295 | |||||||
| 69\119 | 77.311 | |||||||
| 29\50 | 77.3 | |||||||
| 76\131 | 77.354 | Golden meantone (696.2145¢) | ||||||
| 47\81 | 77.366 | |||||||
| 65\112 | 77.381 | |||||||
| 18\31 | 77.419 | Meantone is in this region | ||||||
| 61\105 | 77.460 | |||||||
| 43\74 | 77.4775 | |||||||
| 68\117 | 77.493 | |||||||
| 25\43 | 77.519 | |||||||
| 57\98 | 77.551 | |||||||
| 32\55 | 77.57 | |||||||
| 39\67 | 77.612 | |||||||
| 7\12 | 77.7 | |||||||
| 38\65 | 77.949 | |||||||
| 31\53 | 77.987 | The fifth closest to a just 3/2 for EDOs less than 200 | ||||||
| 55\94 | 78.014 | Garibaldi / Cassandra | ||||||
| 24\41 | 78.049 | |||||||
| 65\111 | 78.078 | |||||||
| 41\70 | 78.095 | |||||||
| 58\99 | 78.1145 | |||||||
| 17\29 | 78.161 | |||||||
| 61\104 | 78.205 | |||||||
| 44\75 | 78.2 | |||||||
| 71\121 | 78.237 | Golden neogothic (704.0956¢) | ||||||
| 27\46 | 78.261 | Neogothic is in this region
The generator closest to a just 11/7 for EDOs less than 1800 | ||||||
| 64\109 | 78.2875 | |||||||
| 37\63 | 78.307 | |||||||
| 47\80 | 78.3 | |||||||
| 10\17 | 78.431 | |||||||
| 43\73 | 78.539 | |||||||
| 33\56 | 78.571 | |||||||
| 56\95 | 78.5965 | |||||||
| 23\39 | 78.6325 | |||||||
| 59\100 | 78.6 | |||||||
| 36\61 | 78.6885 | |||||||
| 49\83 | 78.715 | |||||||
| 13\22 | 78.78 | Archy is in this region | ||||||
| 42\71 | 78.873 | |||||||
| 29\49 | 78.912 | |||||||
| 45\76 | 78.947 | |||||||
| 16\27 | 79.012 | |||||||
| 35\59 | 79.096 | |||||||
| 19\32 | 79.16 | |||||||
| 22\37 | 79.279 | |||||||
| 3\5 | 80.000 | |||||||
Tunings above 7\12 on this chart are called "negative tunings" (as they lessen the size of the fifth) and include meantone systems such as 1/3-comma (close to 11\19) and 1/4-comma (close to 18\31). As these tunings approach 4\7, the majors become flatter and the minors become sharper.
Tunings below 7\12 on this chart are called "positive tunings" and they include Pythagorean tuning itself (well approximated by 31\53) as well as superpyth tunings such as 10\17 and 13\22. As these tunings approach 3\5, the majors become sharper and the minors become flatter. Around 13\22 through 16\27, the thirds fall closer to 7-limit than 5-limit intervals: 7:6 and 9:7 as opposed to 6:5 and 5:4.
Scales within 9edf
Livewire (this is the original/default tuning)
- 77.995
- 701.955
- 779.950
- 1403.905
- 1481.905
- 2105.865
- 2183.860
- 2807.820
- 2885.815
- 3509.775
- 3587.770
Corrugated (this is the original/default tuning)
- 155.990
- 701.955
- 857.945
- 1403.910
- 1559.900
- 2105.865
- 2261.855
- 2807.820
- 2963.810
- 3509.775
- 3665.765
- 4211.730
- 4367.720
- 4913.685
- 5069.675
- 5615.640
- 5771.630
- 6317.595
- 6473.585
- 7019.550
- 7175.540
- 7721.505
- 7877.495
- 8423.460
Snowcone (this is the original/default tuning)
- 233.985
- 701.955
- 935.940
- 1403.910
- 1637.895
- 2105.865
- 2339.850
- 2807.820
- 3041.805
- 3509.775
- 3743.760
- 4211.730
- 4445.715
- 4913.685
- 5147.670
- 5615.640
- 5849.625
- 6317.595
- 6551.580
- 7019.550
- 7253.535
- 7721.505
- 7955.490
- 8423.460
Swan (this is the original/default tuning)
- 311.980
- 701.955
- 1013.935
- 1403.910
- 1715.890
- 2105.865
- 2417.845
Cloudscape (this is the original/default tuning)
- 389.975
- 701.955
- 1091.930
- 1403.910
- 1793.885
- 2105.865
- 2495.840
- 2807.820
- 3197.795
- 3509.775
- 3899.750
- 4211.730
- 4601.705
- 4913.685
- 5303.660
- 5615.640
- 6005.615
Pylon (this is the original/default tuning)
- 467.970
- 701.955
- 1169.925
- 1403.910
- 1871.880
- 2105.865
- 2573.835
- 2807.820
- 3275.790
- 3509.775
- 3977.745
- 4211.730
- 4679.700
- 4913.685
- 5381.655
- 5615.640
- 6083.610
- 6317.595
- 6785.565
- 7019.550
- 7487.520
- 7721.505
- 8189.475
- 8423.460
Quest (this is the original/default tuning)
- 545.965
- 701.955
- 1247.920
- 1403.910
- 1949.875
- 2105.865
- 2651.830
- 2807.820
- 3353.785
- 3509.775
- 4055.740
- 4211.730
- 4757.695
- 4913.685
- 5459.650
- 5615.640
- 6161.605
- 6317.595
- 6863.560
- 7019.550
- 7565.515
- 7721.505
- 8267.470
- 8423.460
Purgatory (this is the original/default tuning)
- 623.960
- 701.955
- 1325.915
- 1403.910
- 2027.870
- 2105.865
- 2729.825
- 2807.820
- 3431.780
- 3509.775
- 4133.735
- 4211.730
- 4835.690
Molten Pelog (this is the original/default tuning)
- 155.990
- 311.980
- 701.955
- 857.945
- 1247.920
Molten Slendro (exact tuning from 3edf)
- 233.985
- 467.970
- 701.955
- 935.940
- 1169.925
Music
- ’HUH?’ by Mandrake (2022): https://m.youtube.com/watch?v=J5gntG5LrOk