I personally know one teacher of magic who had a strong drama background, and who used to give her students advice in how to speak, especially when teaching or speaking to a group. I don't know that she ever worked up a formal system of magical elocution; however, in connection with speaking, she did have clear ideas about the role of magnetizing, the solar plexus, polarity, and so on. But they were dropped into discussions in a "casual" way, and as far as I know were never written up in manual form.

LeGrand