An S Gradient or Curve in Substance Designer?

acealmighty13

I'm looking to create an S curve or gradient for height information.  A smooth transition between the peaks and valleys.  Can be found on a lot of wooden trim if you look at the profile image.  I've tried a couple different ways myself with little luck.  I know a little of the Pixel Processor node and was told from the Allegorithmic board may be the way to go.  I'd like to see if anyone here has such a curve/gradient or knows a way to pull it off so I can understand on how to pull it off. 

noosence

Do you want something like this?