Hello all,
I’m pretty sure there is a way to have the jaw drawings change simultaneously with the mouth drawings when doing lip-sync for big jawed characters. Anybody knows how to do that? Of course, no auto lip-sync involved. I’m using Harmony 10.0.1.
Thanks a lot for your help. 
Dom
Probably the easiest way to do it would be to make a combined mouth/jaw element. This way you could use it with auto lip-synch also. This would mean that the design for the face would need to incorporate the mouth/jaw combo element in a seamless way.
Put the mouth drawing on one layer (i.e. Line Art) and the jaw position on another (i.e. Colour Art). Copy and paste the drawing so that you now have a clone. In the original drawing, place a “Line-Art” module underneath it and attach in between it and the composite. Under the second drawing, add a “Colour-Art” module. This way you’ve can control each part with its own peg, but by switching one drawing (or mouth shape), you’ll switch the jaw as well.