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Am 16.12.2014 17:25, schrieb Urs Liska:
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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