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Re: Partcombine not working for orchestral parts?


From: Ben
Subject: Re: Partcombine not working for orchestral parts?
Date: Fri, 13 Jul 2018 10:36:44 -0400
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 7/13/2018 9:59 AM, Torsten Hämmerle wrote:
Hi Ben,

Combining two parts is not a trivial task and, sometimes, automatic
\partcombine will not produce optimal results.


*What has happened in your example?*
In measure 2, Flute 1 rests, and therefore, the e' is marked "Solo II", has
neutral stem direction and there is no rest symbol for Flute 1 (see above,
case 1).

Directly after that, Flute 1 kicks in again and \partcombine automatically
switches to polyphonic notation (case 3).

All in all, this is a rather unfortunate solution because of the missing
rest, it is very obscure where Flute 1 actually comes in and it is hard to
distinguish Flute 1 from Flute 2.


*Solution*
In cases like this, \partcombine can be directed by using \partcombineApart
(polyphonic notation as in case 3), \partcombineChords for case 2 and
\partcombineAutomatic to switch back to automatic behaviour.



I follow you.

Please bear with me...

Taking Kieren's workaround into account, and seeing as how you can certainly work around this 'bug', it does seem rather difficult to be able to predict when you'll need the "once partcombineapart" in the music until you go to actually *combine* the parts in a staff, and see the missing rest(s), correct?

What I mean is, when you're inputting notes into flute 1, you input the notes and rests normally - not really thinking about down the road that some rest here and there might not appear, depending on what the other flute part is doing, so I better put "once...apart" in the code to handle it. Follow?

So what's the best way to do this in your opinion? Should every instance of brief rests like this in one part but not the other be prefaced with "once...apart" just to be sure, or is that overkill? Thanks for helping me understand this powerful utility!


On 7/13/2018 9:48 AM, Kieren MacMillan wrote:
Hi Ben,

Currently I'm struggling to understand why partcombine won't work as I expected it to...for orchestral works, it's common to have, say 2 flutes, on the same staff in the full score but for the parts, only print flute 1 and 2 on separate parts without the other music included. (http://lilypond.org/doc/v2.19/Documentation/notation/multiple-voices)
However, I followed along in the documentation and can't figure out why my quarter note rests won't appear in voice 1, but other duration rests do appear.
To me, that looks like a bug in \partcombine.

Workaround:

     \relative { e'4( f g a) | \once \partcombineApart r4 f4 g f | c'2~ c2 | f8 f e e f r f f |r1 | f4 g g g | c c c }




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