I fully coded a lipsync "engine" for easy coding, and made all the mouth 'expressions' for anyone wondering how I did it in basically an hour, look at the charts!! it actually helps a lot. also, if you want your animation to be less stiff, make multiples of the same letters/sound blends! I like to make one, and then another that's a bit less wide, and goes out and up away from the nose a bit more. ( I'm not sure how to explain that well !! you can look inside the project to get an idea of what I mean ) :D
PLEASE DO NOT USE THESE MOUTHS! this is NOT a free asset! I can make a project explaining how to animate lipsyncing if anyone wants it, though :) song - find the music in you okay but I NEED an acapella group irl to sing this, I would pay big money for an mlp concert-