Hi all,
I have problems getting the edition-engraver to run properly, but I
think the underlying issue is general enough so others may help too.
Well, initially it went quite well, but now I see a problem with the
partcombiner.
IISC the edition engraver accesses the voices *after* the partcombiner
does his job (I think so because the partcombiner merges voices when the
input is parsed (???) while the edition-engraver works when for example
the measure numbers are already known). So it is clear that I can't
access individual voices that have been merged to \partcombineChords.
And I think I can't address the original music variables independently
either.
But that's not what I'm writing for.
I banged my head against the wall because the edition engraver didn't
seem to be able to access the voices anymore in a given context, all
that worked was addressing the staff (which proves that the basic set-up
is correct).
Now I realized that the edition engraver produces a log file, and that
gave me the clue to why the addressing didn't work anymore (although not
about the underlying reason).
It seems LilyPond created new voices implicitly along the way of the
piece, and therefore I'd have to address them not by "Voice.A" anymore
but by "Voice.B" or ".G" etc.
From the measure numbers in the log I see that the spawning of new
Voices is related to the partcombiner.
Basically my score works by concatenating music variables to each
"part". But here I experiment with temporary part combinations.
There are four violoncello parts, originally engraved on individual
staves. The idea is for selected sections to temporarily merge voices on
fewer staves because that's musically clearer. So (pseudo-code)
violoncelloI may look like
vc = {
\one
\two
\partcombine
\threeI
\threeII
\four
}
I have the impression that LilyPond creates a whole set of new voices
when the \partcombine section happens, and this is what makes the voice
list for that staff go up to "V" in the attached log.
So I think in order to get that to work smoothly I'd need either of the
following solutions:
- talk LilyPond into not starting new Voices each time (or at least
reusing old voices)
- enable the edition-engraver to address voices by their name instead of
their index
(I think the voice names stay the same in the partcombiner)
Any ideas would be greatly appreciated.
Urs
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