Andrew Devis takes a look at some basic techniques for creating lip sync animation in After Effects providing a foundation for all the tools necessary to create a simple mouth rig that will facilitate and ease the animation process for mouth positions and phonemes.
the basics of a character animation lip-sync technique in After Effects that uses time remapping to select which mouth shape to use at any time
The basis of this two part tutorial on After Effects Lip Synching is rooted in Time Remapping, which will allow you to select the proper mouth shape to use for the right section of audio.
Building a rig for lip synch animation in After EFfects that uses both a slider and a layer, Andrew demonstrates the premise for lip synch workflow in After Effects. Check out the tutorial for Basic Lip Synch Animation Techniques in After Effects, Building a Simple Lip Synch Rig here.