Description:
Returns a key function for sorting chords based on a weighted sum
of the positions in each chord's inclusion vector, calculated for
the equivalence classes represented in CLASSREPS. This parameter
should be a list of INCL-CLASSREP expressions, which have a
special syntax. For more information, see PARSE-INCL-CLASSREPS
and its documentation.
The modulus of the pitch class space defaults to 12 but can be set
to other values via the optional parameter N.
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