Topic on Talk:The Legend of Heroes: Trails in the Sky
I'll quote the github on that
"This is a new (lite) version of the original SoraVoice, by removing some uncommon used features, it has better compatibility and performance. Not like the original one, game update WON'T break the lite one (hopefully).
If you are playing Trails in the Sky series, please use this lite version. Since the original SoraVoice is no longer under maintenance, and doesn't support this series with latest updates."
the original soravoice supported the spite changes from kai and all of that jazz, but since they were pretty unpopular and caused incompatibility with the newer versions the guy just dropped it