I've found that whenever I'm in trance, if the hypnotist tells me to say something out loud I just think it in my head and mouth the phrase instead.
But not just that, if it's any sound made with my mouth, the sound just doesn't come out, it's just like how I'm so relaxed even if I try to move my arms they won't as if I forgot how to move them, it's like my vocal cords are so relaxed they won't vibrate.
Or maybe I can't speak while in hypnosis because my subconscious has set up a wall to keep me from making too much noise at night(I never listen to hypnosis files in the morning, no time to do that) so it stops me from speaking while in trance, because something similar to not being able to speak happens to me at night sometimes too, but it's different because that's just because I have no need to speak, and if I try too I still can.
Has anybody else experienced loss of voice while in trance?