Description:
Performs pc- or p-space inversion of P-OR-PC by a designated INDEX.
The default case is a pc-space of twelve equal steps per octave
(semitones). The optional parameter N can be used to specify a
different number of equal steps per octave, or it can be set to NIL
for p-space.
Will tolerate integers out of the mod-N range in P-OR-PC and INDEX
when performing pc-space inversion.
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