Multitrack audio with QMidi

QMidi v2 can play multitrack mov. files.
The creation of multitrack .mov files can be achieved with this free software:
https://apps.apple.com/it/app/multitrackmaker/id1597920140?mt=12
Online help:
https://www.mixagesoftware.com/en/multitrackmaker/multitrackmaker_help.html

With v2 you will need a multi-channel audio interface connected to an external audio mixer.
You can also use a third party audio mixing software, like Logic Pro X or any other DAW:
https://www.mixagesoftware.com/en/qmidi/tutorials.html#screencast7

QMidi Pro v3 (under development) will incorporate a channel mixer, see preview:
https://fb.watch/qBe-cOgTjb/

Sample multitrack mov file (from https://isolated-tracks.com/sting/it-s-probably-me ):
https://www.mixagesoftware.com/private/exchange/Sting%20-%20It%27s%20Probably%20Me.zip