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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 }
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