EasyABC, and I vaguely remember other software doing the same, asks in a preliminary screen about anacrusis, time signature, key and other stuff. Of course this is no use if you do not have that information about the piece. In the absence ot this information you can go forward by listening to the music and getting what you need and then doing the import again. A sort of double import.

Joe started the thread. Joe are you asking for volunteers to transcribe the midi tracks to ABC. Jack Campin seems to be the expert.