Have you ever dreamed after having applied some modifiers to an image to put this exact result in some kind of 
                    Blending Mode
                    Define how overlapping pixels are blended together
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                     over the original image ?
        Well overlay is there for that !!! Lucky little bastard.
        On the example below you see 2 groups of modifiers (identical). One is applied directly on the image (left red square). But this image looks smooth like it could be applied as multiply blending mode over the original image to do a nice effect.
        Well, then just create an overlay modifier, set it as "multiply" as on the image below, drag and drop your modifier or group of modifiers and there it is!
                    
 
                    
                    
                            As you'll see, the blending mode of the Overlay modifier is exposed inside the 
                    Element Tree
                    The hierarchical structure of Smode elements
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                    , as any Layer :
                    
 
                    
                    
                            Also note that more complex setups can be done in the same philosophy with the 
                     Compo Based
                    Use a complex setup to create versatile procedural modifiers
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Compo Based
                    Use a complex setup to create versatile procedural modifiers
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                    .