Hi Frieder and thanks for that complete procedure.
My problem is at this step : “Set the output of the MIDI Track to "Virtual MIDI.” I can’t do this because the control of the inspector “midi controller” doesn’t change at all. It is suppose to have several possibilities (and virtual midi at last, which could effectively be usefull with garage band) but my controls remains at “no connection”.
The track is a midi track.
i’ll try in the order of your description, maybe…