Making \unfoldRepeats work with \repeat volta structure

\globalizeMusic is a possible solution for the problem you get when you put all your \repeat volta structures in a separate music variable (named generally \global ) and then you want to unfold all your music (for MIDI output for example).
Suppose you have defined the following :

   global = { s1 \repeat volta 2 { s1} \alternative {{s1} {s1} }} 
   musicA = \relative { c1 d e f g}
   musicB = \relative { \clef bass c,1 d e f g}

Then, the function \globalizeMusic can be used like this :

   \globalizeMusic
      \new StaffGroup
           {<<
                \new Staff  \musicA
                \new Staff  \musicB
           >>}

It will have the same effects than

    \new StaffGroup
          {<<
                \new Staff  <<\global \musicA>>
                \new Staff  <<\global \musicB>>
          >>}

BUT all the \repeat volta structures will be copied inside each Staff, so that you will get the correct unfolded music when you call \unfoldRepeats. (not true using the traditionnal <<\global \music>> structure ).
The pdf here shows the behaviour of the function.

To use \globalizeMusic, you have to download 2 files : globalizeMusic.ly and also extractMusic.ly (because globalizeMusic.ly uses extractMusic.ly internally). You can find extractMusic.ly here and globalizeMusic.ly here These 2 files should be put in the same directory.

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=767


global = { s1 \repeat volta 2 { s1} \alternative {{s1} {s1} }} 
musicA = \relative c' { c1 d e f g}
musicB = \relative c' { \clef bass c,1 d e f g}

oldWayScore = \new StaffGroup  <<
    \new Staff <<\musicA \global>>
    \new Staff <<\musicB \global>>
  >>

\score { \oldWayScore }
\score { \unfoldRepeats \oldWayScore }