I'm currently working on a project which involves a character becoming possessed by one of the other characters who at this point is deceased.
My initial thoughts related to the combination of two voices in order to create the sound of the possessed voice, like they did in the exorcist. My only problem is that neither characters share any similar dialogue apart from one word. Also, ADR isn't an option for project.
Does anyone have any advice or can recommend some clever pieces of software to make the possessed characters voice sound similar in tonality to the other characters.