Wow, a bit complicated isn't it.  But I can certainly give it a try.  This same source BVH file also has the character walking a few strides, the stop and turn 180, then walk a few strides, stop, turn 180, walk a couple strides then stop.  Are there issues I need to be aware of to extract the 180's?  Would I be looking at the z-rotation values there?

Thanks for all the input.  You've all grasped my problem and I was happy to see some steps that I understood how to do! lol  Thanks again!

Nebula