Ah, I understand why you wanted that "random transition parameter" button now. Hmm, I like the idea. Obviously this isn't really something that would work with every transition (I think the cube, slide, wipe, etc, would look quite bad if their parameters were changing), but for the Grid transitions it definitely looks a lot more interesting. I'll have to have a little bit of a think about this sort of thing. I'm not sure what would be the most user-friendly way to incorporate this sort of thing into MixEmergency. Thanks for creating the video too - it makes it a lot easier to understand what you're wanting.