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| Some heuristics for finding delta-rational chords: | | Some heuristics for finding delta-rational chords: |
| * If a chord with a given step numbers in an edo is delta-rational it or similar numbers will usually also be delta-rational in nearby edos. | | * If a chord with a given step numbers in an edo is delta-rational it or similar numbers will usually also be delta-rational in nearby edos. |
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| == Incomplete list of approximate DR chords in small edos ==
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| (Chords whose range is < 1200¢ and only contains ratios of 1's and 2's between related dyads. Decide on error bound and search programmatically)
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| === 9edo ===
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| * 0-4-7 (+1 +1)
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| === 10edo ===
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| * 0-4-7 (+1 +1)
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| === 11edo ===
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| * 0-2-4-7 (+1 +? +2)
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| * 0-3-7 (+2 +3)
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| * 0-3-6-8 (+1 +? +1)
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| * 0-3-6-10 (+1 +? +2)
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| * 0-3-7-9 (+1 +? +1)
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| * 0-3-8-10 (+1 +? +1)
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| * 0-4-7 (+1 +1)
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| * 0-4-10 (+1 +2)
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| * 0-4-6-9 (+1 +1)
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| * 0-5-7 (+2 +1)
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| * 0-5-9 (+1 +1)
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| * 0-5-8-10 (+3 +? +2 (?))
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| * 0-6-9 (+3 +2)
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| * 0-6-10 (+1 +1)
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| * 0-6-8-10 (+2 +? +1)
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| === 12edo ===
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| * 0-4-10 (+1 +2)
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| === 13edo ===
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| * 0-2-7 (+1 +3)
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| * 0-2-11 (+1 +6)
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| * 0-2-4-7 (+1 +? +2)
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| * 0-2-4-11 (+1 +? +5)
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| * 0-2-5-8 (+1 +? +2)
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| * 0-2-6-10 (+1 +? +3)
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| * 0-2-7-9 (+2 +? +3)
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| * 0-2-7-11 (+1 +? +3)
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| * 0-2-8-10 (+2 +? +3)
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| * 0-3-8 (+1 +2)
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| * 0-3-10 (+1 +3)
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| * 0-3-7-9 (+1 +? +1)
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| * 0-3-7-11 (+1 +? +2)
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| * 0-3-8-10 (+1 +? +1)
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| * 0-3-9-11 (+1 +? +1)
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| * 0-4-10 (+1 +2)
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| * 0-4-6-8 (+3 +? +2)
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| * 0-4-6-9 (+1 +? +1)
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| * 0-4-7-9 (+3 +? +2)
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| * 0-4-7-10 (+1 +? +1)
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| * 0-5-7 (+2 +1)
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| * 0-5-9 (+1 +1)
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| * 0-5-7-9 (+2 +1 +1)
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| * 0-6-9 (+3 +2)
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| * 0-6-9-11 (+2 +? +1)
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|
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| === 14edo ===
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| * 0-3-9-11 (+1 +? +1)
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| * 0-5-9 (+1 +1)
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| === 18edo ===
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| * 0-3-8 (+1 +2)
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| * 0-3-11-13 (+1 +? +1)
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| * 0-3-12-14 (+1 +? +1)
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| * 0-3-13-15 (+1 +? +1)
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| * 0-4-7-10-13 (+1 +? +1 +1)
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| * 0-5-7-11 (+1 +? +1)
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| * 0-5-9 (+1 +1)
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| * 0-5-13-16 (+1 +? +1)
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| * 0-5-14-17 (+1 +? +1)
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| * 0-6-11 (+1 +1)
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| * 0-6-11-15 (+1 +1 +1)
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| * 0-7-10 (+2 +1)
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| * 0-7-17 (+1 +2)
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| * 0-7-9-14 (+1 +? +1)
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| * 0-7-10-15 (+2 +1 +2)
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|
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| === 21edo ===
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| * 0-3-6-11 (+1 +1 +2)
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| * 0-6-11-19 (+1 +1 +2)
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| == Higher-order differences of frequency == | | == Higher-order differences of frequency == |