It would be really useful to capture speed, intonation and other things involving expression from a sample from somebody else. It seems quite hard to describe t

It would be really useful to capture speed, intonation and other things involving expression from a sample from somebody else. It seems quite hard to describe those as text is not enough, and even harder to correctly generate them from a database that contains no matching expression. I imagine that currently you can't turn the speech into a track for a rollercoaster scream.