[Lilypond-auto] Issue 3819 in lilypond: NR Amendment to 1.6.3 Writing Parts - Known issues and warnings

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Documentation

New issue 3819 by address@hidden: NR Amendment to 1.6.3 Writing Parts -  
Known issues and warnings
http://code.google.com/p/lilypond/issues/detail?id=3819

On 18/01/14 16:58, Jan Hajic, jr. wrote:
> Hello,

> the difference in processing of quotes and tags leads to unintuitive
> behavior when quoting voices with tags. Specifically, this comes up in
> exporting parts from a score: cues are for parts only and should not
> be left in scores.

> A minimal example is:

> ----------------------------------------------------

> \version "2.18.0"

> outputTypeTag = "isScore"

> firstInstrument = \relative c' {
> \tag #'isPart { \cueDuring #"quoteSecondInstrument" #UP { r2 } }
> \tag #'isScore { r2 }
> e4 f |
> g4 a b c |
> }

> secondInstrument= \relative c'' {
> c4 c r2 |
> \cueDuring #"quoteFirstInstrument" #DOWN { r2 }
> c4 c |
> }

> \addQuote quoteFirstInstrument \firstInstrument
> \addQuote quoteSecondInstrument \secondInstrument

> \new Staff <<
> \keepWithTag \outputTypeTag \firstInstrument
> > > >>
> \new Staff <<
> \keepWithTag \outputTypeTag \secondInstrument
> > > >>
> ----------------------------------------------------------

> The cue voice in measure 2 of secondInstrument will display "e f"
> instead of "g a". This is because when creating the quote in \addQuote
> quoteFirstInstrument \firstInstrument, no tags
> are applied, so instead of interpreting the first two measures of
> firstInstrument as "alternate versions", it interprets them as
> consecutive music, throwing the synchronization between the quote and
> \secondInstrument by two measures. However, because the new Staff with
> \firstInstrument is created with the tag, the synchronization of the
> two voices stays correct -- only the cue notes are off.

> The correct solution is to apply the tag when creating the quote:

> \addQuote quoteFirstInstrument \keepWithTag \outputTypeTag  
> \firstInstrument
> \addQuote quoteSecondInstrument \keepWithTag \outputTypeTag  
> \secondInstrument

> Although perfectly logical, this behavior leads to a strange error in
> the output. I believe this should be mentioned in the documentation.

> Proposed amendments to the documentation:

> http://www.lilypond.org/doc/v2.17/Documentation/notation/writing-parts#quoting-other-voices
> section Known issues and warnings:

> "The quoting voice and the quote created with the \addQuote command
> should have the same tags applied to them (\addQuote qInstrument
> \keepWithTag #'someTag \instrument). Synchronization problems may
> result otherwise: if there are alternatives in the quoted voice that
> are selected from by tags (for instance: cues when exporting parts),
> they will be interpreted as consecutive music when LilyPond is
> creating the quote."

> http://www.lilypond.org/doc/v2.17/Documentation/notation/different-editions-from-one-source#using-tags
> section Known issues and warnings:

> "Tags in voices that get quoted may cause hard-to-debug behavior. See
> http://www.lilypond.org/doc/v2.17/Documentation/notation/writing-parts#quoting-other-voices,
> section Known issues and warnings."

> I hope this report/suggestion is useful.


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