Pattern: PCreep

Loop length-note segment, progressing creep notes after repeats repeats.

Example output

>>> p = PCreep(PSeries(), 3, 1, 2)
>>> p.nextn(16)
[0, 1, 2, 0, 1, 2, 1, 2, 3, 1, 2, 3, 2, 3, 4, 2]