Could you be more specific than just saying "tween" again? What is it you want to do? Because the transition parameter (I assume that is what you are referring to) of the Animate command does as tiler describes, and it works great when I use it. That is, to smooth out transitions from one animation sequence to another you set the transition parameter greater than 0 (most of the time I use 3) when calling the Animate command to start a new animation.