Expression vs Dynamics

RichP

I am trying to understand how to use Dynamics and expression with Session Strings Pro 2.

In settings under Dynamics I am using the mod wheel but is shows cc 11(Expression). If I tap it a few times it changes to cc1 (dynamics). I have no control over this. I just have to keep tapping between the mod whell and velocity until it changes. Is that how this works.

How do I assign a fader to CC11(Expression). I was assigning it to the kontakt volume fader but I believe this is incorrect.

Also, If I use the mod wheel for what I believe is dynamics and then draw in expression in the midi Editor, the expression changes have no affect.

I am totally confused.

Thanks for any assistance you ca provide.