I'm in P2012 SR3.1 x64 W7, but doesn't that have the same Python implementation as P9?

There is no error, just nothing happens.

By the way, I had a little blip with your BVH mixer. If the existing file is too short, the script hangs while it's trying to add frames, and clicking cancel causes a crash. (This isn't tragic, as I can just make sure the project has enough frames.)

I would be eternally grateful if you could sort out Emphasizer. It seems to be the only decent tool for editing animations.