Hi Alex
I have a PA1x pro and as you know the Korg also use a touchscreen.
To navigate through the style (or sound) section pages you don't have to use the screen, but you can use the style (sound)buttons itself.Push a style (or sound)button again and the next tab appear on your screen.
Only when you choose a style (or sound)to play you must touch it on screen.
For changing a parameter you only have to select it on screen and use the dial button.
Once you are used to it, it's very easy and quick.
Maybe Roland use the same method.

Jan