Hello,
I was creating a material for a transition animation (pic.1) and it works as intended (pic. 2), however I couldn’t figure out a way to blend two textures into this material so that one would represent white color while the other represents black color (similar to mask in the Photoshop)
Thanks
Presumably you’re controlling this with the param? Then you don’t need the sin, I don’t think?..
Anyway, you can use this B&W signal to drive a lerp node that has the two texture attached to it 
I tried to connect lerp node before, but it always resulted in awkward results. Some materials that I tried:
First one looks more correct but try putting a saturate node before plugging the alpha into the lerp. Most likely you have values that are out of the 0-1 range which is causing the lerp to “overdrive” the blend.