At first acoustics attributed to the different sounds only a limited number of characteristic features.
It's a different way of getting across an emotion. You're trying to get it across to the animator because the animator is inspired by the voicetrack in terms of how to animate the character.
Russell Crowe is very difficult, but it's worth it. He's the real thing. I can tell you this. Russell Crowe was just as difficult before he was an international star as he was afterwards.