Yes you can as they are just MIDI tracks.
The term MIDI Supertracks is, as far as I know, a term that PGMusic uses for MIDI tracks played by professionals using MIDI controllers. These are far superior to other PGMusic MIDI tracks.
Yes, Mario, that is absolutely correct.
We usually (but not always) set a Hi-Q patch to go along with it, and that is just a custom MIDI sound we make, and of course that can be replaced with any other MIDI sound that you have. The MIDI Supertracks are far superior to regular MIDI tracks that we make - regular MIDI tracks are just "patterns" mapped to chord scales, whereas the MIDI SuperTracks are based on recordings of actual musicians playing differently in each recorded key and each chord.