For that kind of effect, I would focus on the H910/H949 mode in the Pitchfactor. Change the Scale / Speed knob to Normal for the finest incremental changes and the largest overall range. (Or to Micro if an overall range of approximately +/- 100 cents would be sufficient).
Target the Pitch A and/or Pitch B knobs over MIDI [KB2 – KB3]. Set your MIN VAL to 0.800 and your MAX VAL to 1.200 in the PitchFactor, or set the limits externally in the MIDI transmitting device. Set the Key/Depth knob to MODERN for the most accurate output.
In the MicroPitch mode, it's possible to stretch the maximum detuning range to +/- 100 cents. "Latch" the Flex button physically, with a 'dummy' AUX SWITCH plug, or assigned over MIDI to an 'on' state. The values set in the Pitch A / Pitch B knobs are doubled.
