We also practise all kinds of voices at times when DD is not upset and make it a game. "whisper, whisper" voice, and get DD to copy you. "rar, rar" like a lion voice, really loud voices and singy voices and .... Then, when DD is out of control, you can try whisper whisper voices and she might be able to start copying and calm herself down. Teaching her different voices when she is calm is easier than when she is upset.