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Slashed beams

Slashed beams are printed by using the special stencil procedure beam::slashed-stencil. The slash may be printed at the left or right side of the beam and is further customizable by overrides of the details subproperties over-beam-height, slash-slope, slash-side, slash-stem-fraction, slash-thickness, and slash-X-positions. Note that those subproperties negotiate with each other to get a pleasing output, i.e., changing one of them may have impact on others.

mus = \repeat unfold 4 a16

{
  \override TextScript.rotation = #'(15 1 0)
  \override Beam.stencil = #beam::slashed-stencil
  \mus
  <>^"slash-side" %% default: LEFT
  \once \override Beam.details.slash-side = #RIGHT
  \mus
  <>^"over-beam-height" %% default: 0.75
  \once \override Beam.details.over-beam-height = #1.5
  \mus
  <>^"slash-slope" %% default: 2
  \once \override Beam.details.slash-slope = #1.0
  \mus
  <>^"slash-stem-fraction" %% default: 0.3
  \once \override Beam.details.slash-stem-fraction = #0.6
  \mus
  <>^"slash-thickness" %% default: 0.1
  \once \override Beam.details.slash-thickness = #0.2
  \mus
  <>^"slash-X-positions" %% default: (-0.5 . 1)
  \once \override Beam.details.slash-X-positions = #'(-1 . 2)
  \mus
}