> On 9 Sep 2024, at 23:10, Morten Lemvigh <morten.lemv...@gmail.com> wrote:
>
> Hi,
>
> I am experimenting with a system to create choir rehearsal midi files. A part
> of that is to unfold repeats. I have a function that accepts a score and
> creates a new score. The steps are:
> 1. Extract the music from the score
> 2. Unfold the repeats
> 3. Make a new score
>
> For some reason only the first note of the score is repeated and I get a
> "programming error: Moment is not increasing. Aborting interpretation."
>
> When I try to display-scheme-music of the unfolded music it looks like
> everything is there, but it is not included in the final score.
> I have tried to create a minimal example that reproduces the issue. It is
> pasted below.
>
> So the question is: what have I misunderstood? :-)
>
> Best regards,
> Morten
>
> \version "2.24.2"
>
> choirScore = \score {
> \new Staff {
> \relative c' {
> \repeat volta 2 {
> c d e f
> }
> }
> }
> }
>
> make-rehearsal =
> #(define-scheme-function
> (the-score)
> (ly:score?)
> (ly:make-score (unfold-repeats-fully (ly:score-music the-score))))
>
> new-score = #(make-rehearsal choirScore)
> \new-score
What I found very useful in my case for the rehearsal tracks is the
rehearsalMidi function from the openlilylib gridly grit-templates include,
which I’ve been using stand-alone in my own (historically grown and improved)
choir arrangements.
https://github.com/openlilylib/snippets/blob/master/ly/gridly/grid-templates.ily
As an inspiration here’s how I’ve organised things in my system (which no doubt
could be improved):
A folder <songname> per song
Variables for each of the voices’ notes (sopMusic, altMusic etc) and each of
the voices lyrics (sopWords, altWords etc) each defined in a file named after
the voice (soprano.ily, alto.ily etc)
The main composition file bringing it all together <songname>.ly
```
\version "2.19.3"
\header {
…
}
\paper {
first-page-number = 1
}
global = {
% defines tempo, initial key, time signature
}
\include "soprano.ily"
\include "alto.ily"
\include "tenor.ily"
\include "basso.ily"
\include "../temlates/SATB.ily"
```
Include-files to setup a staff per voice in a templates folder
e.g. for Soprano (soprano.ily):
```
\version "2.22.0"
soprano_Staff = {
\new Staff = soprano \with {
instrumentName = "Soprano"
shortInstrumentName = "S"
}<<
\new Voice = "soprano" { \clef "treble" \global \sopMusic }
\tag #'lyrics {\new Lyrics \with {alignBelowContext=sopStaff} \lyricsto
soprano \sopWords}
>>
}
```
Include-file for an entire arrangement layout that includes the relevant
per-voice templates and then goes on to defined the overall music as the
allMusic variable
```
allMusic = {
<<
\metronome
\new ChoirStaff <<
\soprano_Staff
\alto_Staff
\tenor_Staff
\basso_Staff
>> % end of ChoirStaff
>> % end of full system
}
```
Which is then used both to create a full SATB-score sheet music as per
```
\book {
\bookOutputSuffix "lilypond"
\score {
\removeWithTag #'metronome
\allMusic
\layout {}
}
}
```
A tutti-track with all music at regular volume:
```
\book {
\bookOutputSuffix "tutti"
\score {
\unfoldRepeats { \removeWithTag #'lyrics \allMusic }
\midi {
\context {
\Score
dynamicAbsoluteVolumeFunction = #hatikwaDynamics
}
}
}
}
```
And per-voice highlighted tracks (using the rehearsal-midi function, which,
among others, unfolds the music and lowers the volume of all voices except the
voice given as its argument) e.g. for the soprano group:
```
\rehearsalMidi { \removeWithTag #'lyrics \allMusic } "soprano"
```
