Maybe this can be helpful to you or anyone else. I was just reminded
when working on a solution for another issue involving beams, that
beams.positions are one of the most useful settings.
Here it is in relation to your example:
{
\override Beam.concaveness = #+inf.0
a8[ r] e8[ r] a,8[ r] a'''8[ r] |
}
{
\override Beam.positions = #'(0 . 0)
a8[ r] e8[ r] a,8[ r] a'''8[ r] |
}
Best
Peter
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