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Re: Issue 4205: Improve part combiner's rest analysis (issue 174610043 b

From: Urs Liska
Subject: Re: Issue 4205: Improve part combiner's rest analysis (issue 174610043 by address@hidden)
Date: Tue, 25 Nov 2014 14:58:45 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Am 25.11.2014 14:50, schrieb Dan Eble:
On Nov 25, 2014, at 04:21 , Urs Liska <address@hidden> wrote:
Is the following assumption correct?

At the beginning of m.2 the partcombiner treats the crotchet and the full 
measure rests as two voices.
Yes.  The part combiner directs those rests into voices “one” and “two”.

At the second crotched, when \one begins to play notes this is considered 
"solo" because \two doesn't play at that moment.

OK. Thanks for confirming.
In the meantime I've already sent a new bug report to bug-lilypond:

When I explicitly instantiate a "solo" voice in the \score block this will be 
somehow merged with the voice implicitly created by the partcombiner.
Yes.  You could do the same with voices “one”, “two”, and “shared”.

Ah, yes, that's something I had intended to ask but forgot.
Maybe this may help me solving a few other issues in our score.

OK. It seems this may be a way to fix all issues with the output but as you say 
it's not pretty. Actually I'd say it's inacceptably ugly. In my concrete score 
this would mean I'd have to write such a dummy voice for the 800 measure piece, 
for all partcombined instruments.
In a work of that scale, I agree.

The scale of the score just makes it inacceptably impractical to use. But of course this is generally an area where one seems to need quite hacky approaches. And probably not one I'll write a glorifying blog post about ...

For my own work, which is mostly vocal and mostly short, I have modified the 
part combiner never to create solo sections.  When one part rests, both parts 
are engraved; when both parts rest, they are combined into one.  It sounds like 
this is probably not what you need, but if it would help you, I could give you 
a patch.  I do not know when I will be able to contribute it to Lilypond 
because I am trying to find a more general solution to part combiner 

On first sight this sounds like a viable solution for my case, so I'd gladly try out the patch. The problem is that I won't get (all) the contributors to run custom builds, so I'd have to direct them at patching their installation (assuming it's a Scheme-only patch), and I'm not so sure if that's something everybody would like ...



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