change midi settings

standalone_output.ly

@@ -47,6 +47,14 @@ TEXT = \markuplist {
           % Tempo des midi files
           tempoWholesPerMinute = #(/ midiQuarterNoteSpeed 4)
         }
+        \context {
+          \Staff
+          \remove "Staff_performer"
+        }
+        \context {
+          \Voice
+          \consists "Staff_performer"
+        }
       }
     }#})
 ))