6.1.3 Paired substitution functions

Some \override commands require a pair of numbers (called a cons cell in Scheme). To pass these numbers into a function, either use a pair? variable, or insert the cons into the music function.

manualBeam =
#(define-music-function (parser location beg-end)
                        (pair?)
#{
  \once \override Beam #'positions = #$beg-end
#})

\relative {
  \manualBeam #'(3 . 6) c8 d e f
}

or

manualBeam =
#(define-music-function (parser location beg end)
                        (number? number?)
#{
  \once \override Beam #'positions = #(cons $beg $end)
#})

\relative {
  \manualBeam #3 #6 c8 d e f
}

[image of music]


Other languages: espaƱol.

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