That's what I did here:
https://vimeo.com/11236546
Attach the lip-synch.
Then just plot the controllers that are moving.
Use those curves wherever you want.
Like for instance I used the Y on the corners of the mouth to controll varrious parts of my face like cheeks...
No Mocap here.
-manny
Manny Papamanos
StingRay | MotionBuilder | Maya | Mudbox
Games QA Specialist