I have seen the tutorial where RL suggests removing the jaw bone to close the NPCs mouth in Unity when it is animated, great for nonspeaking NPCs.  But this fix only works for NPCs that don't talk (aka don't have viseme tracks).  So my NPC moves and talks in the Unity scene.  All works great other than the NPC has a mouth hanging open during times when they are not speaking.   All my iClone animated NPCs look like this when they are not talking.  I'm guessing there is a setting or two that I don't know about or some other thing.  Is there an iClone trick or setting or a Unity trick I should be using when I create my animations for this that I don't know about?  
Thanks!