Reply to Im looking at getting an s2 and i have a ?

I would like to get an external fx controller(not sure if thats what they are called). Like a kaoss mini or something but im not sure if the s2 is compatible with external things. Im almost sure you cant plug them directly in to the s2 cause there is no audio in(that i saw). So if anyone could help me out. Id just like some extra fx and i believe kaoss pads look sick. Also is it possible to hook any kind of external fx to the s2.

Thank you =)