This class is missing documentation.
PitchClass.new(pitch, octave: 4, alter: 0)
.calcpitch(thispitch, thisoctave)
.initPC(argpitch, argoctave, argalter)
.mapIntoRange(range: 6, target, numturns: 0, maxturns: 10, origval)
.modalTranspose(steps: 0, fromAPitchCollection, toAPitchCollection)
.pitch_(newpitch, newoctave)
.transpose(aPitchInterval, direction: 'up')
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link::Classes/PitchClass::