Blend 2 displacing textures for landscape?

I was able to glean enough information from MostHost LA;s post to start messing with stuff. I figured it out, and even solved a problem he was having which was different displacement levels depending on the layer.
It’s as simple as that.


I came across the issue of “crack free displacement” actually causing cracks and removing all displacement, so that stumped me for a while, but once I got that sorted, it was really actually quite simple.