CD Projekt Red uses AI to restore Polish Geralt's voice

CD Projekt Red's approach to Polish Geralt in The Witcher 3: Songs of the Past is a useful case study for anyone working with AI and voice performance. Jacek Rozenek, who has voiced Geralt in Polish since the first game, still records every new line himself. CDPR then uses a model from Ukrainian firm Respeecher, trained on his original Witcher 3 recordings, to reshape those takes so they match his 2015 sound. The reason is practical as well as creative: after a 2019 stroke, his voice is now lower and gruffer, and the team feared the mismatch would stand out in older parts of the map. Localization producer Mikolaj Szwed described it as a special case tied to Rozenek's health. He also said CDPR's contracts require consent for any AI work. For studios, writers and performers, the lesson is clear: consent, approval and clear contracts should come first when AI touches a human voice.