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please show some evidence: the MIDI file you're trying and claim that is not working; and the precise plugin or soft-synth and soundfont (.sf2) you're using. I'm sure we can look into it and see what and where is the problem you're facing. sincerely.

OTOH. MIDI notes per se doesn't contain any pitch-bend information whatsoever... pitch-bend are in fact separate event messages that apply to ALL notes that are possibly playing at one time on a given channel. It is responsibility of the instrument plugin or standalone soft-synth to apply and render the pitch deviation as whole to all active voicing oscillators; qtractor just writes the MIDI events into the plugin or instrument module as input, then routes the output audio PCM signal that is produced in due response to those MIDI messages.

If it is not working, or it seems not to, as you say, then it could be one of several reasons: a) there are no MIDI pitch-events on the file, track or channel; b) the instrument (or soundfont) is not coping, ignoring, missing or otherwise not sensitive to MIDI pitch-bend events. etc.

byee