Traktor and instant grat fx mapping question

Hello everyone !
I wanted to map my CMD DC 1 from behringer to instant gratification FX, like a MF.
But I have a problem with my mapping : I mapped a first button (button A) to a effect : a command "fx on" and another "set value to 0.8" , then another button (button B) to the same effect, with a different value : here again two commands ( "fx on" and "set to value 0.6")

when i press A, then B (A still pressed), my effect is going from 0.8 to 0.6 so that's ok, but when i release A, the effect is turned off, even if i'm still pressing B... Any ideas to avoid that ?

Thanks for your help.