Re: empty midi file output from guitar tab

[Martial]

write a second score without layout block


\version "2.10.10"
    guitarline = {
        a,4\5 c'\2 a\3 e'\1
    }

     \score {
          <<
              \new TabStaff = "gtr" {  \guitarline }
           >>
        \layout {
           \context { \RemoveEmptyStaffContext  }
        }
    }

     \score {
          \guitarline
          \midi {  }
     }


> This simple line in guitar tab produces a correct pdf score and a midi 
> file, but
> the midi file does not have any notes or durations in it. So it plays 
> but makes no sound.