Okay, Here's the skinny on BVH files... First, open up the Keyframe Editor. You'll see that every part in every frame is Keyframed. BVH does this when imported... What you'll have to do is delete the Body Keyframes (all of them) and move the body to ground level in Key Frame 1. But then you'll have to ALSO make the body move as it had done in the original Anim... In the end, you're MUCH better off dropping the figure to the floor in each frame.