On 09/16/2016 06:24 AM, David Wright wrote:
On Thu 15 Sep 2016 at 17:15:02 (-0600), David F. wrote:
I have a song in 9/8 time with a pickup of three eighth notes.  I expect 
Lilypond to beam those three eighth notes together, but it does not when I 
combine two voices with partcombine.

Am I doing something wrong?  Is Lilypond doing something wrong?  How might I 
work around this?

Well, it's only last week that you asked "Is there a way to combine
two voices and print both stems (up and down) when the voices share a
note?  \partcombine does not appear to do this by default."

So now you've demonstrated the danger of doing that: it interferes
with the beaming. Isn't the answer just to decide on your priorities?

\partcombine #'(0 . 9)   will combine the unison notes and allow the
flag to become a beam in the appropriate direction.
Manually beaming either of the parts (or both, of course) will do the
opposite: produce beams above and below.
Which do you want?

To selectively disable the double stem for just that unisono note, you can adorn that note with \once \partcombineUnisono. You may want to \set Staff.aDueText = ##f to disable the 'a2' marking for the unison note.


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