Toolbox tools -Merge Mode functions

Several of the toolbox tools -Smear, smudge, brightness, blend etc have Merge Mode settings.  These are Add, Subtract, if lighter, Logical functions etc.  None of them are grayed out so I assume that they have functions. 

I can't get any of them to do anything "logical". If I get anything, it is usually a dark or light stripe.
I can't find any mention of these in the online help.  Any help from users?
Thanks --Pat

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  • Hi Pat,
    It still works in PhotoPaint X6.
    However, it's a pain to use. There's very little control and it changes
    the pixels of the layer on which you are painting. I prefer to paint (or
    whatever) on a new layer and then change the merge mode of this layer. You
    can then easily make changes, vary opacity, and even discard the new layer
    without having to back up.
    Phil
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