12L 5s

↖11L 4s	↑12L 4s	13L 4s↗
←11L 5s	12L 5s	13L 5s→
↙11L 6s	↓12L 6s	13L 6s↘

Brightest mode	LLLsLLsLLLsLLsLLs
Period	2/1
Range for bright generator	7\17 (494.1¢) to 5\12 (500¢)
Range for dark generator	7\12 (700¢) to 10\17 (705.9¢)
Parent MOS	5L 7s
Sister MOS	5L 12s
Daughter MOSes	17L 12s, 12L 17s
Equal tunings
Supersoft (L:s = 4:3)	26\63 (495.2¢)
Soft (L:s = 3:2)	19\46 (495.7¢)
Semisoft (L:s = 5:3)	31\75 (496¢)
Basic (L:s = 2:1)	12\29 (496.6¢)
Semihard (L:s = 5:2)	29\70 (497.1¢)
Hard (L:s = 3:1)	17\41 (497.6¢)
Superhard (L:s = 4:1)	22\53 (498.1¢)

12L 5s is the MOS pattern of the Pythagorean/schismic enharmonic or mega-chromatic scale. In contrast to the superpyth enharmonic scale, in which the enharmonic diesis (negative diminished second) is larger than the chromatic semitone, here the reverse is true: the enharmonic diesis is smaller than the chromatic semitone, so the diatonic scale subset is actually proper.

This MOS separates its small steps by intervals of 3L-2L-3L-2L-2L. Its major third of -4 generators approximates an interval between 24/19 and 32/25, thus its generator is a perfect fourth between 7\17 (494.118 cents) and 5\12 (500 cents).

The leapday/leapweek version is proper, but the Pythagorean/schismic version is improper (it does not become proper until you add 12 more notes to form the schismic 29-note scale).

Modes

Mode names are borrowed from the Subaru scale, proposed by Declan Paul Boushy.

Mode	UDP	Mode name
LLLsLLsLLLsLLsLLs	16|0	Harumi
LLLsLLsLLsLLLsLLs	15|1	Yuzuha
LLsLLLsLLsLLLsLLs	14|2	Maho
LLsLLLsLLsLLsLLLs	13|3	Sakura
LLsLLsLLLsLLsLLLs	12|4	Hanako
LLsLLsLLLsLLsLLsL	11|5	Saori
LLsLLsLLsLLLsLLsL	10|6	Machiko
LsLLLsLLsLLLsLLsL	9|7	Sae
LsLLLsLLsLLsLLLsL	8|8	Kaguya
LsLLsLLLsLLsLLLsL	7|9	Nae
LsLLsLLLsLLsLLsLL	6|10	Sachiko
LsLLsLLsLLLsLLsLL	5|11	Kaori
sLLLsLLsLLLsLLsLL	4|12	Kanako
sLLLsLLsLLsLLLsLL	3|13	Sakurajima
sLLsLLLsLLsLLLsLL	2|14	Kaho
sLLsLLLsLLsLLsLLL	1|15	Suzuha
sLLsLLsLLLsLLsLLL	0|16	Narumi

Scales

• Pythagorean17 – Pythagorean tuning
• Nestoria17 – 171edo tuning
• Cotoneum17 – 217edo tuning
• Garibaldi17 – 94edo tuning
• Subaru scale – 41edo tuning

Scale tree

Generator ranges:

• Bright generator: 494.1176 cents (7\17) to 500 cents (5\12)
• Dark generator: 700 cents (7\12) to 705.8824 cents (10\17)

Bright generator						Cents	L	s	L/s	Comments
7\17						494.118	1	1	1.000
					40\97	494.845	6	5	1.200
				33\80		495.000	5	4	1.250
					59\143	495.105	9	7	1.286
			26\63			495.238	4	3	1.333	Leapfrog
					71\172	495.349	11	8	1.375
				45\109		495.413	7	5	1.400	Leapweek
					64\155	495.484	10	7	1.428
		19\46				495.652	3	2	1.500
					69\167	495.808	11	7	1.571	Leapday / polypyth
				50\121		495.868	8	5	1.600
					81\196	495.918	13	8	1.625	Golden neogothic (495.9044¢)
			31\75			496.000	5	3	1.667
					74\179	496.089	12	7	1.714
				43\104		496.154	7	4	1.750
					55\133	496.241	9	5	1.800
	12\29					496.552	2	1	2.000	Basic 12L 5s (Generators smaller than this are proper)
					53\128	496.875	9	4	2.250
				41\99		496.970	7	3	2.333	Undecental
					70\169	497.041	12	5	2.400	Argent tuning (497.0563¢)
			29\70			497.143	5	2	2.500
					75\181	497.238	13	5	2.600	Unnamed golden tuning (497.2540¢)
				46\111		497.297	8	3	2.667
					63\152	497.368	11	4	2.750	Kwai
		17\41				497.561	3	1	3.000	Garibaldi / andromeda
					56\135	497.778	10	3	3.333
				39\94		497.872	7	2	3.500	Garibaldi / cassandra
					61\147	497.959	11	3	3.667
			22\53			498.113	4	1	4.000	Garibaldi / helenus, Pythagorean tuning (498.0450¢)
					49\118	498.305	9	2	4.500	Pontiac
				27\65		498.462	5	1	5.000	Photia
					32\77	498.701	6	1	6.000	Grackle↓
5\12						500.000	1	0	→ inf