Delta-rational chord: Difference between revisions

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 === Delta signature ===
 A delta-rational chord is determined by two things:
-* the dyad formed by its lowermost two notes
+* the dyad formed by its lowermost two notes;
-* its ''delta signature'' which has integer ratios, i.e. a list of (scaled) frequency increases between successive notes, their ratios showing the simple rational relationships
+* its ''delta signature'' which has integer ratios, i.e. a list of (scaled) frequency increases between successive notes, their ratios showing the simple rational relationships, with a + before each increase.
+For example, a chord with a +1+2+1 delta signature is ''a'':(''a''+1):(''a''+3):(''a''+4) for some ''a''.
 Dyads with no rational relationship (or no obvious one) are often indicated with +?.