Can I set a threshold with a node for Live Link values

I am using Live Link to animate a 2D character.
I try to use the value of jawOpen for “a” and mouth Funnel for “o”.
But when I perform an “a” in front of the camera I get these values:
jawOpen: around 0.800
mouth Funnel: around 0.300
So my 2D character performs a mixture between “a” and “o”.
Can I set a threshold with a node that sets mouth Funnel to 0 when it´s under 0.400?