More documents for Landscape Non Weight-Blended layer?

I see some description here:

Non Weight-Blended - Layers that are independent of each other. Painting a non weight-blended layer does not affect the weights of the other layers. These are used for more advanced effects, such as blending snow onto other layers: instead of having grass, mud, rock or snow, you would use a non weight-blended snow layer to blend between “grass, mud, or rock” and “snowy grass, snowy mud, or snowy rock.”

However, I try to blend 2 such layers using LandscapeLayerBlend, after painting, finally it seems each layer get an opacity of 0.5, and I can neither increase nor decrease a layer.

Is there any other introductory materials for Non Weight-Blended layer?

Thanks!

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Or, does Non Weight-Blended layers only work with LandscapeLayerWeight? But you lose the Height Blend?

For non weight-blended layers you can hold the [Shift] key while painting to erase (paint to zero) parts of your alpha layer.