When I exchange one of the midi-tracks with a midi-track of another style and try to export this track via drag and drop, it doesn't work. The exported midi-file is empty and the track is afterwards empty too.
One way is to freeze the track, then it works, but the exported midi-data are on midichannels of the harmonizer. Its quite mysterious. Can someone reproduce this issue? My system is Mac OSX10.11 and Biab 2015 v. 105.