I have never tried Polish language, but I found Audio2Face looks better when you apply a motion to the character.
Have you watched a video I just made a few weeks ago on Audio2Face an IClone?
I made another video where I showed how the head moves back and forth in IClone.
Was your problem similar to that, where the head shakes back and forth?
This was made before I learned if you apply a motion to the character, it stops or at least reduces the head back and forth.
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