Thanks Klaus, I can cnogirm I get the same results.
So where do I have to put that \include?
This is the Default.ly tha t I can extract from the .oxt :
\transpose %{OOoLilyPondCustom1%}c c'%{OOoLilyPondEnd%}
{
%{OOoLilyPondCode%}% For getting started read (copy URL into your web browser):
%
https://github.com/openlilylib/LO-ly%
http://lilypond.org/doc/stable/Documentation/learning/simple-notation%%
% Use the "Custom 1" to transpose your music _expression_. E. g. try "e a'".
\key e \major e8 fis gis e fis8 b,4. | e2\fermata \bar "|."
%{OOoLilyPondEnd%}
}
\include "lilypond-book-preamble.ly"#(set-global-staff-size %{OOoLilyPondStaffSize%}20%{OOoLilyPondEnd%})
\paper {
#(define dump-extents #t)
ragged-right = ##t
line-width = %{OOoLilyPondLineWidth%}17\cm%{OOoLilyPondEnd%}
}
\layout {
indent = #0
\context {
\Score
\remove "Bar_number_engraver"
}
}
that \include is present here, and if I copy and pas de Default.ly in Frescobaldi I get the correct thing (see the .png as attachment); but if I simply try to insert the music fragment by using the Default inside LibreOffice I get a whole page snippet...