Denon MC4000 Traktor pro2 problem

Hi I have a problem with fx filters in traktor pro2 I have denon MC4000 and a use original traktor pro2,but everithing works great asept fx, they react on tuch or scrool but on speacker there is no any fx change.

I’ve send the guy a PM, it’s most likely a case of “what are those fx1, fx2, fx3, fx4 buttons on traktor deck for?”