node-addon-lilypond/output/share/lilypond/current/mf/debugging-settings.mf

% Used for example to print glyphs with stafflines
test := 0;

if test = -1:
  % TODO: what's this?  Seems to be broken...
  mode := smoke;
fi;

% change this to 0.5 to have glyphs positioned on
% staff spaces instead of stafflines in testing mode
% (useful e.g. to check how accidentals visually interact
% with stafflines in different configurations).
stafflines_y_offset := 0;