4L 18s

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↖ 3L 17s ↑ 4L 17s 5L 17s ↗
← 3L 18s 4L 18s 5L 18s →
↙ 3L 19s ↓ 4L 19s 5L 19s ↘
┌╥┬┬┬┬╥┬┬┬┬┬╥┬┬┬┬╥┬┬┬┬┬┐
│║││││║│││││║││││║││││││
││││││││││││││││││││││││
└┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┘
Scale structure
Step pattern LssssLsssssLssssLsssss
sssssLssssLsssssLssssL
Equave 2/1 (1200.0¢)
Period 1\2 (600.0¢)
Generator size
Bright 5\22 to 1\4 (272.7¢ to 300.0¢)
Dark 1\4 to 6\22 (300.0¢ to 327.3¢)
TAMNAMS information
Descends from 4L 6s (lime)
Ancestor's step ratio range 4:1 to 1:0 (ultrahard)
Related MOS scales
Parent 4L 14s
Sister 18L 4s
Daughters 22L 4s, 4L 22s
Neutralized 8L 14s
2-Flought 26L 18s, 4L 40s
Equal tunings
Equalized (L:s = 1:1) 5\22 (272.7¢)
Supersoft (L:s = 4:3) 16\70 (274.3¢)
Soft (L:s = 3:2) 11\48 (275.0¢)
Semisoft (L:s = 5:3) 17\74 (275.7¢)
Basic (L:s = 2:1) 6\26 (276.9¢)
Semihard (L:s = 5:2) 13\56 (278.6¢)
Hard (L:s = 3:1) 7\30 (280.0¢)
Superhard (L:s = 4:1) 8\34 (282.4¢)
Collapsed (L:s = 1:0) 1\4 (300.0¢)

4L 18s is a 2/1-equivalent (octave-equivalent) moment of symmetry scale containing 4 large steps and 18 small steps, with a period of 2 large steps and 9 small steps that repeats every 600.0¢, or twice every octave. 4L 18s is a great-grandchild scale of 4L 6s, expanding it by 12 tones. Generators that produce this scale range from 272.7¢ to 300¢, or from 300¢ to 327.3¢.

Modes

Modes of 4L 18s
UDP Cyclic
order
Step
pattern
20|0(2) 1 LssssLsssssLssssLsssss
18|2(2) 6 LsssssLssssLsssssLssss
16|4(2) 11 sLssssLsssssLssssLssss
14|6(2) 5 sLsssssLssssLsssssLsss
12|8(2) 10 ssLssssLsssssLssssLsss
10|10(2) 4 ssLsssssLssssLsssssLss
8|12(2) 9 sssLssssLsssssLssssLss
6|14(2) 3 sssLsssssLssssLsssssLs
4|16(2) 8 ssssLssssLsssssLssssLs
2|18(2) 2 ssssLsssssLssssLsssssL
0|20(2) 7 sssssLssssLsssssLssssL

Scale tree

Scale Tree and Tuning Spectrum of 4L 18s
Generator(edo) Cents Step ratio Comments
Bright Dark L:s Hardness
5\22 272.727 327.273 1:1 1.000 Equalized 4L 18s
26\114 273.684 326.316 6:5 1.200
21\92 273.913 326.087 5:4 1.250
37\162 274.074 325.926 9:7 1.286
16\70 274.286 325.714 4:3 1.333 Supersoft 4L 18s
43\188 274.468 325.532 11:8 1.375
27\118 274.576 325.424 7:5 1.400
38\166 274.699 325.301 10:7 1.429
11\48 275.000 325.000 3:2 1.500 Soft 4L 18s
39\170 275.294 324.706 11:7 1.571
28\122 275.410 324.590 8:5 1.600
45\196 275.510 324.490 13:8 1.625
17\74 275.676 324.324 5:3 1.667 Semisoft 4L 18s
40\174 275.862 324.138 12:7 1.714
23\100 276.000 324.000 7:4 1.750
29\126 276.190 323.810 9:5 1.800
6\26 276.923 323.077 2:1 2.000 Basic 4L 18s
Scales with tunings softer than this are proper
25\108 277.778 322.222 9:4 2.250
19\82 278.049 321.951 7:3 2.333
32\138 278.261 321.739 12:5 2.400
13\56 278.571 321.429 5:2 2.500 Semihard 4L 18s
33\142 278.873 321.127 13:5 2.600
20\86 279.070 320.930 8:3 2.667
27\116 279.310 320.690 11:4 2.750
7\30 280.000 320.000 3:1 3.000 Hard 4L 18s
22\94 280.851 319.149 10:3 3.333
15\64 281.250 318.750 7:2 3.500
23\98 281.633 318.367 11:3 3.667
8\34 282.353 317.647 4:1 4.000 Superhard 4L 18s
17\72 283.333 316.667 9:2 4.500
9\38 284.211 315.789 5:1 5.000
10\42 285.714 314.286 6:1 6.000
1\4 300.000 300.000 1:0 → ∞ Collapsed 4L 18s