Its impossible to state with certainty whether a particular vocal level or tone has more success in hypnosis. There have been no scientific studies as far as I am aware. However, I think that naturally, people are more receptive to suggestions delivered in a neutral tone, and theyre less receptive to any information delivered as a command or in an authoritarian tone. Its human nature. We dont typically like to be told what to do. But this is not to say that either method doesnt work.
Of course I am talking more about the use of hypnosis for therapy. For lets not forget that stage hypnotists invariably use a stronger, more powerful tone of delivery. They have to. Theyre putting on a show a for the benefit of hundreds of spectators. Plus theyre often talking to a group of people at the same time. In this forum, there is the entertainment factor which dictates the approach. The firm delivery of the stage hypnotist doesnt seem to compromise the success of the hypnosis. A soft mellow voice or Mickey Mouse cartoon type voice would not work in this context.
As a hypnotherapist I personally prefer to speak in a normal voice, slowly, and use a soft, clear tone. This is...