Description:
Performs pc- or p-space transposition of P-OR-PC by a designated
INTERVAL. 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 INTERVAL
when performing pc-space transposition.
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