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CD Projekt Red is using the AI voice tool Respeecher to alter the voice of Jacek Rozenek, the Polish actor who voiced Geralt, for the new Witcher 3 expansion Songs of the Past. Rozenek suffered a stroke in 2019 that left him unable to speak for a while and lowered his voice, so his new lines would have sounded odd beside his 2014 recordings. Respeecher's model was trained on his original lines from the original game, and Respeecher's synthetic speech artist Dmytro Vasylets told Game File that getting the result took dozens of hours of model training and work with the CDPR team. Rozenek told Game File that he has great trust in the game's creators and feels very good about the acting results. CD Projekt Red stressed that this was a special case and its localization producer Mikołaj Szwed said the company would not use AI to alter anyone's voice without that actor's express permission. The tool is not expected to be needed for The Witcher 4, where Geralt is older and a deeper voice would be less jarring. IGN noted that AI remains controversial in gaming.