Hey there
I made a small macro wich needs some explanation
Its a erosion device wich i connected to coordinates and the fall off of a radial grad
Wich makes it highly vercitile (figure out what you can do with it)
It also houses my new technique called switchview,wich i would like to explain
And also would like to implement in more macros…at least if its a good tool
If not then i cancel that project…
Anyways i atttached some files to see about switchview
It alows you to see what your (in this case) fall off/mask input selection is and you can still alter it
If you switch back you see the result 
I hope this will help some people who would like some concentrated erosion in their terrain
Maybe on different heights,with a height chooser
If there are questions,just ask
Have fun!