If I recall from an Adastra Discord chat, I don't they'll be adding official voices in the game. Buuut they're youtubers do voices while reading the vn. Just look up "Ave, Adastrians!" on Youtube.
If anyone's not aware of what's happened, Adastra is going to be on a month hiatus after this month. So the creator can focus more on Smoke Room and dealing with his writer's block.