You might want to start out with a base patch similar to this: PitchFactor Harmony Thirds discussion. Use the Quadravox mode for more voice layering options, or switch to the Diatonic mode, with the ability to 'recycle' harmony voices.
I didn't spend enough time with your example to nail down the exact key center & minor scale variation, but change the Key/Depth and Scale/Speed knobs to the appropriate values. Those two quick phrases sounded like the FX routing might have included a thick flange, or at least some significant detuning. If you'd like to emulate that effect using only the Pitchfactor, you'll need to adjust (in Quadravox mode) the Delay A knob somewhat higher than 4 ms.
For realistic harmony lines, I'll often assign an expression pedal to the wet Mix (0% – 50%). That gives the ability to weave the harmony lines in & out smoothly, and break up the illusion of a 'perfect' second guitarist tracking the lead lines. But for sudden entrances (like those found in your example), try assigning the Mix knob to an aux switch instead. You'd want the harmony to snap in and out.
Under System settings – AUX SW – KB0 > (select TIP/RNG /T+P). MIN VAL 0% MAX VAL 50%.
