Guide frame

Guide frames are the most recent formulation of "nice" scales in Inthar's theory. A guide frame consists of:

1. a guided generator sequence (GGS) GS(g1, g2, ...), where each generator subtends the same fixed number of steps in the scale;
2. a polyoffset (offset chord) for that generator sequence where every copy of the generator sequence has the same length. This is the unison for scales with only one GGS chain and a dyad for scales with two GGS chains. LssLssLssMssLssLssMss has three GGS chains; note that the polyoffset is also GS(s).

Scales that consist of an offset but where the two chains have different lengths can be formulated as a modification of a guide-frame scale. An example is chiral diachrome which can be modified from achiral diachrome by moving one note from one GGS chain to the other.