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Partcombine and autoBeamOff

The function of \autoBeamOff when used with \partCombine can be difficult to understand.

It may be preferable to use

\set Staff.autoBeaming = ##f

instead, to ensure that autobeaming will be turned off for the entire staff.

\partCombine apparently works with 3 voices – stem up single, stem down single, stem up combined.

An \autoBeamOff call in the first argument to \partCombine will apply to the voice that is active at the time the call is processed, either stem up single or stem up combined. An \autoBeamOff call in the second argument will apply to the voice that is stem down single.

In order to use \autoBeamOff to stop all autobeaming when used with \partCombine, it will be necessary to use three calls to \autoBeamOff.

{
  %\set Staff.autoBeaming = ##f % turns off all autobeaming
  \partCombine
  {
    \autoBeamOff % applies to split up stems
    \repeat unfold 4 a'16
    %\autoBeamOff % applies to combined up stems
    \repeat unfold 4 a'8
    \repeat unfold 4 a'16
  }
  {
    \autoBeamOff % applies to down stems
    \repeat unfold 4 f'8
    \repeat unfold 8 f'16 |
  }
}