on qtractor (and in many other MIDI sequencers out there, regardless of being Linux or not), MIDI tracks (should) convey only one sounding instrument, program, patch, whatever, and only one; a MIDI track maps 1-to-1 to a MIDI channel address, although you may have several on the same channel.
this has been one fundamental model/design rule and nothing you say or argue will change that, sorry--there's no why's, only how's--in fact it's all rather conventional, like keeping each thing onto its own business.
because i say so? ;)
on qtractor (and in many other MIDI sequencers out there, regardless of being Linux or not), MIDI tracks (should) convey only one sounding instrument, program, patch, whatever, and only one; a MIDI track maps 1-to-1 to a MIDI channel address, although you may have several on the same channel.
this has been one fundamental model/design rule and nothing you say or argue will change that, sorry--there's no why's, only how's--in fact it's all rather conventional, like keeping each thing onto its own business.
hth.
cheers