If you go to https://www.digitaljuice.com/products/products.asp?pid=787 (this is one of the products I purchased) you will see that they offer transitions in the form of double alphas. They have a rendering program called “The Juicer” it allows me to render the files as needed for my projects. When i render the transparent (or should be transparent) parts are black and white. I don’t know how to get them to transition as they should.