Description:
For a given list of directed intervals, as specified in CLASSREPS,
calculates how many of each of these intervals can be formed from
an element of FROM-CHORD to an element of TO-CHORD. This result is
known as the 'progression vector'.
Depending on how CLASSREPS is configured, PROG-VEC calculations
may or may not make sense when FROM-CHORD and TO-CHORD are
interpreted as pcsets. (The modulus of the pitch class space defaults
to 12 but can be set to another value via the optional parameter N.)
The CLASSREPS parameter should be a list of PROG-CLASSREP
expressions, which have a special syntax. For more information,
see PARSE-PROG-CLASSREPS and its documentation.
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