Mimic is available at DAZ3D, and is for both Windows and Mac platforms. And the accuracy of the synching is up to you. Mimic takes a mono channel wave file and keyframes the visemes; it also accepts a text input to enhance the accuracy (you can also tweak the spelling of the text to add accents....like if someone says 'apple', spelling it 'aapple' could lengthen the vowel shape of the mouth, as a quick example). Mimic also give access to the facial morphs, so it can create the little twitches and blinks that you might expect from a face, and you can use it to build your facial animations so that the speech and the expressions match. As Mimic outputs a conventional pz3 file, you simply import it into Poser...and since you are using P7, you could create a layer specifically for the Mimic output, and avoid the problems that arise when you don't load the mimic animation in the correct sequence. You also are not limited to the DAZ meshes with Mimic; the latest version supports configuration files that tells Mimic what morphs approximate what visemes. Little Dragon has done several of them, in fact.