Why don't we take the source from the person we want the voice to sound like, because it's preserved, and borrow the filter from someone about the same age and size, because they can articulate speech, and then mix them?
Pse nuk marrim burimin nga personi te cilin duam t'i ngjaje zeri, duke qene se nuk ka demtime, dhe marrim hua filtrin e nje personi me te njejten moshe dhe peshe, duke qene se mund te artikulojne, dhe pastaj t'i perziejme ato?