Yea! Thanks for the responses. This should be perfect.
“Nope, you’re wrong. Just like Tobias said, use Alpha Add. By default AE does not blend opacity linearly. In addition to the Alpha Add mode, the Effects –> Channel –> Blend effect works the same.”
I’m glad to be wrong when being wrong will make my life easier than being right. 🙂
I do still think it takes a lot of work–for a non programer like myself–to replicate some consumer level stock effects in AE. I’d like to be able to do simple slide shows with automatic functions that I can overide. AE does have the flexibility to do this, but it takes a bit of work to set up initially. I needed to do a quick slide show with 300 photos for a client and it was a lot faster for me to to use iPhoto to do a slide show with (slight shudder) the “automatic Ken Burns effect” rather than to try and figure out an expression that would auto scale to comp (by height or width which ever comes first) size at In and zoom from the scaled size to 110% of the initial size at Out. I can do it with a click in iPhoto or I can export the album from iPhoto, batch pre-process the photos in PS (for rendering efficiency), import to AE, manually re sort to match the order in iPhoto (grr), sequence layers, do expressions to do some of what I want and render, but I just didn’t have time to do it and figure out an expression that would auto fit and scale based on layer in and out (for flexibility I need to change the duration of the clips without having to set 300 new keyframes.)