If you mean by using your controllers pitchbender or pitchwheel, then you unfortunately can't, unless i've missed something. I would like to have that option, especially as Arturia have chosen to have the pitchbend to work.
I would also like to have pitchbend as a modulator in the modulation matrix in the extended view.
And an option to let the X-axis of the joystick be controlled by the pitchbend.
As it is now, you have to use other controls to be able to set a range for pitch modulation.
I add a feature request now.