You're supposed to be able to.
![Huh? ???](http://forum.arturia.com/Smileys/classic/huh.gif)
From the manual:
"You can assign a MIDI controller to move through the items in a playlist which is useful for switching presets during a live performance without having to touch the computer."
That doesn't specifically say it responds to Program Change messages tho, I suppose. But seeing as that's merely another MIDI message, I don't see why that wouldn't work.
Note: I personally haven't tried. I've got a MiniLab, and by default one of the knobs on it is assigned to scroll through presets.
![Smiley :)](http://forum.arturia.com/Smileys/classic/smiley.gif)