again, that is a setting on the MIDI instrument end, possibly named "pitch-bend range" or "sensitivity", for which qtractor has no direct access or control (it depends on its MIDI implementation).
please refer to the SF2 sampler instrument you're using or try with another one... here tested with qsynth (standalone), fluidsynth-dssi, calf-fluidsynth (plugins), linuxsampler (server) and through a DB50XG outboard (full old XG, non-SF2 based) -- all played well re. MIDI pitch-bends (although the later with better sound quality ;)
again, that is a setting on the MIDI instrument end, possibly named "pitch-bend range" or "sensitivity", for which qtractor has no direct access or control (it depends on its MIDI implementation).
please refer to the SF2 sampler instrument you're using or try with another one... here tested with qsynth (standalone), fluidsynth-dssi, calf-fluidsynth (plugins), linuxsampler (server) and through a DB50XG outboard (full old XG, non-SF2 based) -- all played well re. MIDI pitch-bends (although the later with better sound quality ;)
cheers