The effect of 2 textures, that are combined using the MultiTexture node
does not only depend from the textures but also from the mode they are
blended with. As it is sometimes difficult to define the look of two textures
being blendend, this examples tries to help you finding the correct blending.
Simply select the blendmode combination from the drop down lists above
and see the change. The first setting defines the blending for the base
texture, the second is responsible for the second