The bars are not true lines (i.e. produced with \rule in TeX), they are
characters (part of the fonts). As such, their thickness cannot simply
be thickened the way the staff lines (which are true lines) are.
You should be able to hack your way around this by redefining the
commands which point to the bar characters:
\GreCPDivisioMinima
\GreCPDivisioMinor
\GreCPDivisioMaior (<- This one is also used for divisio finalis)
\GreCPDivisioDominican
You could, in theory, redefine these to use `\rule[lift]{width}{height}`
instead of the characters in the font. There's probably some trial and
error involved in getting the values for lift, width, and height correct
though. Further, you may want to make these values depend on some of
the calculated dimensions (check the internals section of GregorioRef
for a list of these), so judicious use of `\noexpand` in your
definitions may be in order.
--
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Br. Samuel, OSB
St. Anselm’s Abbey
Washington, DC
(R. Padraic Springuel)
PAX ☧ ΧΡΙΣΤΟΣ
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