Quote - "The old adage says that it takes 64 muscles to frown. My problem is that it seems to take 64 careful dial spinnings for a frown... and I not even sure which they are and how much to move them!  

Frowning is only two muscles - M. corrugator supercilii and depressor supercilii - I have a V3 and a V2 with all muscles implemented as  morph targets - this is the only way to go

Look here : http://en.wikipedia.org/wiki/Facial_Action_Coding_System