Hi zildazz, thanks for the reply. I still do not get it working, but thanks for the hint on the “Additive” Blending… Experimenting with this, but despite the description “Useful when you want to preserve underlying detail or ramps” - it totally destroys for example my volcano, where I want to place a lake into the crater. It’s kind of playing with parameters, but nothing helps. I managed once to get some result using “Min” Blend mode, but cannot reproduce. Still experimenting - it’s kind of a learning curve, I’ll need to experiment - as the plugin says “Still experimental” 
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