Delta

Delta may refer to:

• a delta-d ratio with d > 1 (aka a superpartient ratio or an epimeric ratio), a ratio that is greater than 1 and is not superparticular. The delta-1 ratios are the superparticular ratios.
• the delta scale, a nonoctave scale.
• the frequency difference represented by a dyad, especially in the context of delta-rational chords.

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