I think as described the voice is a symptom, controlling the voice doesn't make so much sense to me as working at the root. DS will have affectations and we address those directly. When he's had poor emotional reactions to feedback, we discuss what would work better for him and try to frame the discussion in terms of achieving the best outcome together where he doesn't end up in a funk. If he has a bad emotional reaction to criticism the last thing he needs is more criticism that can spire into a feedback loop which sets up litle anxiety traps.
