Adjusting figured bass alteration glyphs

In figured bass, specially designed glyphs for 6\\, 7\\, and 9\\ are used by default. Similarly, specially designed glyphs for symbols 2\+, 4\+, and 5\+ are used by default if plus signs appear after the number.

To change that, pass an alist to figuredBassPlusStrokedAlist and set the glyph in question to #f (or omit it).

\version "2.24.0"

\figures {
  \set figuredBassPlusDirection = #RIGHT
  <6\\> <7\\> <9\\> r
  <2\+> <4\+> <5\+> r

  \set figuredBassPlusStrokedAlist =
    #'((2 . "figbass.twoplus")
       ;; (4 . "figbass.fourplus")
       ;; (5 . "figbass.fiveplus")
       (6 . "figbass.sixstroked")
       ;; (7 . "figbass.sevenstroked")
       ;; (9 . "figbass.ninestroked")
      )
  <6\\> <7\\> <9\\> r
  <2\+> <4\+> <5\+> r
}