What are you exporting the BVH motion to? I work with Lightwave and if you use the Poser Pro Pack along with Mimic you can export everything to be used in Lightwave (and 3D Studio Max) - and the movements created using Mimic are exported as well. A did a few tests several months ago and it seemed to work. Of course then you'll have to sync the sound afterwards, but nothing's perfect. Though if you just want to export the BVH information and not any figures... uhh, don't know.