Remove Metronome mark engraver

public_includes/layout_bottom.ily

@@ -1,3 +1,6 @@
+% set the speed of the midi music
+#(define midiQuarterNoteSpeed (if (defined? 'midiQuarterNoteSpeed) midiQuarterNoteSpeed 90))
+
 MUSIC = { \transposable #TRANSPOSITION \MUSIC }
 
 verselayout = \layout {
@@ -67,6 +70,11 @@ TEXT = \markuplist {
     \score {
       \unfoldRepeats { \MUSIC \INLINESCOREMUSIC }
       \midi {
+        \context {
+          \Score
+          % Tempo des midi files
+          tempoWholesPerMinute = #(/ midiQuarterNoteSpeed 4)
+        }
         \context {
           \Staff
           \remove "Staff_performer"