Export score to .mid
I've made a SATB score by Musescore 188.8.131.5249 and when I try to export it to a .mid score, in the exported score appear only 3 voices (A, T, B) and doesn't appear the soprano voice. However, if I export to a .mp3 format all voices appear correctly. It's the same when I try to export each of the parts to .mid, the midi parts appear empty and when I do it to .mp3 the export is done correctly. What could be te reason? and How could I solve this problem?
The same problem happens to me with all the scores I've made.
Thanks for your attention,
Juan José Ros