Parametric design in MoI?

 From:  Frenchy Pilou (PILOU) 7 May 2016  (253 of 912) 
7713.253 
Don't work ?

http://moiscript.weebly.com/uploads/3/9/3/8/3938813/glitch01.nod


Edit: works! I don't must start from a & b but from others! :)

EDITED: 7 May 2016 by PILOU