I use a Korg A3 in the fx loop, but i need to add more.
Just dont know, what, and how:)

Maxx... You say you need to add more... May I ask why? I think for many the 11R effects would be enough. I'm not convinced of that, though; I'm not especially impressed with them, so I can understand the desire to add something. That said, I should think it would be easy to find one unit that adds what you need in the way of effects. Your Korg A3, perhaps, or the Boss GX-700. There are any number of others.

But it seems as though you don't know what kind of effect you think you need. I'm just curious.

From what i know, 11R is kind limited in using various effects at same time.
The A3 is cool, but, also limited (just use it for U2 stuff).
So, if i want to use, for example, 2 delays, i cant use 11R.
I was thinking in a g force, since it has all i need (and more than i need).

give a shot at the zoom ms70cdr or bt100 they both are cheap but awesome for the price