How to do voice coaching:
1. Don’t over direct, let the talent act.
2. Know what you want out of a particular scene and communicate that to the talent.
3. Do not make the talent parrot you, this will make you seem like the asshole you are.
4. Yelling is failing, do not do it.
It is that easy and that difficult. This isn’t a cure all here but rather this is what I have found has worked for me in the past. Every voice director has their style, but if there is one thing you can take away from this very short blog entry it’s you should work with the actor to find the character and not the other way around. Actors are wonderful people if you let them be awesome; so don’t get in the way but don’t let them wander into Mordor either.