“There’s quite a lot of recordings on him,” Webber said. “And each one contains a very different-sounding voice in its own way. So it was finding a middle ground with the different voices, ’cause I think he was always in some way playing a different part… That was part of the process of trying to figure out his voice: Learning the sounds and the shifts that Oswald had and the unusual inflections, then really trying to replicate that and spending hours each day just practicing.