Finding volunteer female voice actors among fans of the game with just two women targeted scenes (Marcus missionary and Jeanette eatout)... We need rally good luck.
That's why that synchronized sprite talk is low on my priority list.
Anyway, I've done some research. That XML controlled sprite talk is easy. But that automatic voice recognition based sprite talk is impossible in AS2 Flash (which is HTH case) because there is no way to access sound binary data. There is some very limited way to access sound data in AS3 Flash, but only 1/10 sec of sound played at the moment, so not much for good voice recognition. Also math support in Flash is poor and the way variables are held is slow for calculations. AS3 Flash is too different from AS2 Flash for feasible conversion of HTH. So I can't make the sprite move mouth per voice recognized in played sound. That's a shame, it would be rally cool.