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i believe this very same questions have been asked on this linuxmusicians.com forum thread, but nevertheless, i'll repeat answers here, just for the record:)

(a) Does Qtractor allow me to change instrument using [MSB][LSB][Prog] mid-track, or does it assume that each track will have one and only one instrument associated with it?
no. one track, one instrument, one program-change on track setup. you can however load midi files that may have program-changes interleaved in sequence. that would play fine, as long and until you set one instrument/bank-select/program-change on a track's properties, which will command that track and midi-channel to obey to that setting whenever and thereafter.

(b) If it is possible to do this with Qtractor, do you have any tips regarding the best way to do it?
the rule as been said above. make it a another track and channel, dedicated to the other instrument/patch/program-change. of course we're dealing about instruments that support bank-select/program-changes which i believe are most external/outboard/hardware ones. not all, if very few, instrument plugins do have support for bank/program/patch switching in between a performance is rolling (ie. realtime). while it might work, when it works, you shall always expect sound gaps, glitches, and or/or effective delays anyhow.

(c) Does Qtractor allow me to use the event list window as an editor, or am I stuck with doing edits in the piano roll window?
yes, you can change event properties or values on the event list. you can also multi-select and remove one or more of them. however, there is no current way to insert events from there. to create new events, you shall use the piano-roll views. sorry :)

hth.
cheers