Re: alternate notes within a part

[Valentin Petzel]

Hello David,

You’re right. \relative does in fact directly change the music events (instead 
of doing it during translation), so removing tagged stuff should not make a 
difference.

I’m not exactly sure about what you mean with the clefs. If one tag changes 
the clefs it would be reasonable to assume that at the end of the tagged music 
the clef is changed back, like
\tag #'A { something } \tag #'B { \clef bass something else \clef treble }

Cheers,
Valentin

Am Montag, 10. Jänner 2022, 01:32:55 CET schrieb David Wright:
> On Sun 09 Jan 2022 at 23:36:41 (+0100), Valentin Petzel wrote:
> > Am Sonntag, 9. Jänner 2022, 23:05:15 CET schrieb David Zelinsky:
> > > I'm engraving a part that can be played either on cello or bassoon, but
> > > with several differennces for short sections:  e.g. a clef change for
> > > one and not the other; a different octave for a few measures; double
> > > stops or not.
> > > 
> > > I want to have just one version of the source, assigned to a variable
> > > (e.g. cello-bassoon-notes = {...} ), with the differences indicated by
> > > short tagged sections (like \tag #'cello {...} \tag #'bassoon {...} ),
> > > so that I can produce output for each instrument seperately from the
> > > same source.
> > > 
> > > There seem to be a couple of problems using tags like this.  First, it's
> > > kludgy because when the notes are parsed, Lilypond includes all notes
> > > from both tagged parts, and complains about bar check failures.  That
> > > doesn't really matter, since when the notes are used (as say
> > > \keepWithTag #'cello) it all comes out right.  And I can avoid the
> > > warnings if I tag full measures only.  But as I said, it's kludgy.
> > > 
> > > Worse is that a clef change in one tagged part affects all the
> > > subsequent music.  And similarly, in \relative mode, the tags are
> > > ignored when Lilypond determines the octave of following notes.
> > > 
> > > Is there a better way to accomplish what I'm trying to do?  Or do I
> > > really just need to maintain completely separate versions for the two
> > > instruments?
> > 
> > Much of what you’re describing should not happen. \keepWithTag and
> > \removeWithTag remove the music before it is parsed.
> > 
> > It is true that using tags with relative music can be a bit messy, as
> > depending on which part you remove the following music will change. You
> > can
> > circumvent this by putting your tagged music in absolute mode.
> 
> I can't replicate that. AIUI the \music=\relative{…} has its pitches
> baked in when the closing brace is read /on input/, regardless of
> any tags read. When the music is set in \score{…}, the pitches can't
> change.
> 
> OTOH any clefs in \music are only enacted as the music is typeset,
> so they shouldn't be included in \music, but separately. Otherwise,
> were a tagged section to finish in the wrong clef, you would have to
> insert an extra clef but suppress its printing—not worth the hassle.
> 
> > Can you send us an example of your problems to see where it may come from?
> 
> Cheers,
> David.

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