Xavier Scheuer from the french list answered me something that works perfectly :
between-system-spacing = #'((minimum-distance . 8) (stretchability . 0))
in the \paper block. Strechability to 0 seems to avoid any fancy spacing by
Lilypond. Minimal-distance is quite convenient because it doesn'
... and it's me again with something that has already treated millions
of times, but I really can't manage with it...
This deals with : VerticalAxisGroup :-[ + TabStaff :-( , in order to
create a French tablature.
Here's my score :
\score{
<<
\new Staff {\hampesprelude} %a line with rythm i
