Layer Blend in advance

hi. i have some questions. i wanna use layer blend for my landscape. i have original textures and normal textures too, but there is some problems. i use materials from kite demo, i wanna use grass, 2 different kinds of rock, forest path, leaf path and stone path. and here are my questions:

  1. which one of them must be “LB Weight Blend” , which one “LB Alpha Blend”, and “LB Height Blend” and why?
  2. what is the work of preview weight? it just gets 0-1 numbers, which one must be 0 or 1 and why?
  3. i already used texture with their normal, but after painting, my materials are like diffuse, not diffuse with normal.
  4. i used “LandscaperCoords” for changing the size of them, but it won’t work. is there any way to do that and be realistic?
    as you finding out, i wanna know them one by one and if there is a document for this information, i will be glad to see that. thanks a lot.

there is an answer for my question, maybe someone here can complete it. Answer in unreal forums

ok, there aren’t any answer. as I understand, weight blend is for texture which must be under the other textures, like stone or dirt. and height is the opposite of weight, it belongs to textures which place on the others, like snow or leaves. about alpha, I don’t have any idea about it. any answer will welcome here.