Using Unity 2018 and the shaderGraph I put this together because I wanted alpha dissolve too + vertex color, addBlend and a single color swatch with ‘overlay’ function for remapping hue
the vertex alpha controls the additiveness but the basic textures are ‘addBlend’ (premultiply blending)
all you have to do is adapt in scrolling of your desires and multiply in a 2nd (3rd or even 4th) texture