CD Projekt Red used generative AI to alter Jacek Rozenek's voice for The Witcher 3 expansion Songs of the Past, as his stroke in 2019 changed his vocal tone. Rozenek, who has voiced Geralt since the original game, gave consent for the modifications, which aim to make his voice "as close as possible to my voice from 12 years ago," he stated.
The AI work involved Respeecher, a company previously used by CD Projekt Red for Cyberpunk 2077's Phantom Liberty expansion. Localisation producer Mikołaj Szwed called the approach "one of those ways where you can use AI ethically," citing consent and the goal of maintaining continuity for players. Rozenek's untreated recordings were described as "deep and gravelly" compared to his original voice.