Re: Lyric extenders in/out of alternatives

[Lukas-Fabian Moser]

Am 05.10.21 um 01:41 schrieb Dan Eble:

> > I'd basically be interested in trying to understand the mechanics involved, but 
> > seeing as term started today at our university, I'm sceptical I can spend 
> > serious time on this before Christmas break. (And there's a fair chance it 
> > would be above my head anyway.)
> Volta_specced_music_iterator emits VoltaSpanEvents carrying i,j,k at the start 
> and end of \volta i,j,k {}.  I expect that Lyric_combine_music_iterator could 
> register for these events and use them to ignore notes that do not apply to the 
> volta of interest.
Thanks for that explanation, which goes on the heap of things I have to 
try to wrap my head around. :-)
> You would want a way to indicate in the ly code that a span of lyrics should be 
> set to a specific volta of the music.  The existing stanza number feature seems 
> obvious, but it would be limiting.  (Examples: a partly through-composed 
> arrangement with 2 stanzas per volta; a transcription of stanzas 1, 5, and 9 of 
> a source in a situation where renumbering is undesirable)

Yes, I agree that StanzaNumber is not the right tool for this: This is 
presentation layer, and as I abuse this every day with (the German 
version of) stuff like \set Stanza = "C major:" - music theory teacher 
here :-) -, I'd be vary of adding any semantic meaning to the contents 
of the Stanza markup.

> I am asking myself, "Why not use \volta for that?" and I don't have an answer 
> yet.

If I understand correctly, this would require writing \volta i,j,k { } 
in \lyricmode at precisely the "right" places in sync with the 
repeats/alternatives in the music. Is that right?

My gut feeling is that stanza-behaviour might be more of a persistent 
(changeable) property of a line of Lyrics: If unset, Lyrics ignore any 
\volta's they encounter in the associated voice. If set (to a volta 
number or a list of such), any voltas they encounter along the way would 
be skipped if the numbers don't match.

Feel free to ignore this if this obvious nonsense with respect to the 
inner workings.

Lukas