This seems to be my biggest hurdle so far. This might be the solution.
I was able to take a user made crossfader to get two of the videos to fade from one to another. I need to make a “stop” for the out faded video upon crossfade completion. And the crossfade needs also work between 3 videos, depending on the amount of people (blobs).
I’ve worked out a 3 way, toggling, video crossfader, triggered by the MaKey MaKey circuit completion. Now to make it more conditional.