IK in armature and RVK

I’m trying to use RVK in my model to make a right deforming of the joints by using the expresion driver, but i built the armature with IK and the bone don’t have and change in their rotation, so i don’t have and control what so ever on my RVK’s, and one know on a work around this one ?

thx in advence…

deforming of the joints

That means Rotation, no? Anyway, you can put some other object on a hidden layer, Keyframe it so it has its own IPO’s or give it a CopyLocation or CopyRotation Constraint form one of the bones, and use it to Drive the RVK.