In Bethesda games (Oblivion, Skyrim, Fallout) there are large modding communities adding new quests, areas and plot lines. But one technical and financial challenge for them has always been voice acting. Not only do they have to worry about voice acting new potential characters, but they have no means of writing new dialogue for existing characters.

In Fallout 4, for example, the protagonist is fully voice acted. That means a distinct change between the way the main game feels, and any modding efforts made by the community (barring actually re-hiring the original voice actor for new lines).

I'm envisioning having this tool train on the already provided voice lines in the game(depending on the character in question, that's quite a bit). And then letting mod authors input new dialogue lines to be spit out in somewhat the actors voice.

Lots of problems with the approach of course, not to mention the fact that these are actors and not just voices (there would probably be significant amount of emotion lost). But it would give the modding community such a powerful tool to add new plots for existing characters.