switching from one effect to another seamlessly in same jit.world

well, I have come pretty far with my patch which is a live visual thing which takes a jit.playlist object and does a bunch of things with it. my patch is too personal to share but it's basically some jit.gl.videoplane stuff. I have found another effect I want to just switch to seamlessly, essentially taking the current place in time of the playlist object and starting the next effect at that point and placement so it doesn't change in a dramatic way, but will play in the same jit.world... I kind of have a hazy notion of moving forward but does anyone else have experience with this kind of thing and maybe some tips that would save me some of the hassle? thanks for any help!