Want advertising talent to love you? Have an unobtrusive button, not on the talkback mic. Lean on it while the clients are discussing things between takes...
There's nothing worse for a voice actor than watching a five minute animated discussion through the glass, not knowing what they're talking about, and then having a producer come on the talkback and say "we'd like it just like the last one only do you think you could hit the word 'In' harder..."
Not only does the actor have to recall everything about that previous take, AND wipe out all the negative worries they had during the discussion, they ALSO have to instantly interpret what the f the producer meant.