The problem is that the variable that's being fed into the material is just a single variable that goes from 0 to 1. So I'm not sure how to use just part of it with the lerp nodes.
you could use an "if" node if your engine has one since it has 3 outputs? you'd need one of the states to be exactly equal to though so it would work as a switch rather than a soft blending. what sort of variable is it you want to pass to this part of the network? i've had a quick play with using multiple lerps and come up…