I'm not into animations, so I'm not positive on this. I'd say try to repeat the same procedure at each node (or whatever you call the frame when a neat change occur, I mean not just the calculated frames in between). If Poser calculates correctly between the nodes, it might well work. You may try to ask support from an animation master, though. How about IMing Geralday or Ockham or paging them in the forum ? They are always very helpful. May be Ockham could come up with one of its magical scripts (if you'r working with Poser5 or Poser Pro pack).