I attach an addition for the manual (Overlay chapter) regarding problems due to handling transparencies. I am attaching both Latex and txt versions if you would like to make corrections/improvements; but even before that is to decide whether to use this text or not. There has been a lot of talk lately about the size achieved by the manual, and this addition goes beyond the request for a simple description of CinGG's functionality, and is a more theoretical and discursive part. It is up to you to decide whether it should be put in or is better not. The texts in square brackets are about the new Blend Algebra and Blend Program plugins, so they are to be ignored until it is decided whether to implement the plugins or not. If the plugins are integrated, I will go ahead and synthesize Georgy's explanations for the manual entry.