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these are standard MIDI file format 1 tracks (MTrk signature).

usually, and by convention, track 0 holds meta-data eg. track name, tempo and time-signature changes, location markers, text lyrics, etc. while all other file tracks numbered 1+ shall have performance-data eg. MIDI channel events, notes and controllers, etc. and are indeed the contents of (one or more) MIDI clips in a qtractor MIDI track.

do not confuse MIDI tracks in qtractor with MIDI tracks on a SMF1 (standard MIDI file format 1). never mind both are called "tracks"--they are not the same and the numbering don't tell you nothing about that.

hth.
cheesrs