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Firstly, why make all those separate shapes when for 90 percent or more of your voice acting needs, combining just three morphs at the right settings - open, wide and narrow - will do perfectly fine?

Secondly, there's no such thing as a unique shape for most of the sounds we make in speaking. For many of the vowels for example, we have quite a range of lip shapes that will work, and which one you'll see in a speaker depends on the sounds that came before. If you use phonemes religiously to match sounds, you'll get an animation that looks extremely silly and not at all realistic.

I assumed phonemes weren't simply about the lips, but also the tongue.

I dunno. There are people who lip read. Maybe they'd be the best to ask about the differences. :)

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