This is very useful for those quirky faces that are hard to read or emotionally ambiguous. The first set of dials control the mouth and tongue of the figure s face. Together the dials control most of the muscles in the lower face. To spread the lips choose positive, and negative to move them closer together. This is demonstrated in the first example, to get the look of gleeful surprise.
Positive values drop the corners of the mouth.
Negative values curves the brow up. Positive values move the inner brow up and the outer brow down. Negative values have the opposite effect. To pucker move the dial positive and to stretch the lips out move to the negative. The lower lips tucks up under the upper teeth with a positive setting, and with negative values, the lower lip juts out.