system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] What is The Voice?

I understand the Bene Gesserit have a preternatural ability to get people to do what they want, but what is it precisely? Does their training just give them a command of rhetoric down to the smallest detail? 

Or is it more like the subject is being forced to do things against their will? I understand that Bene Gesserit (some more than others) are biologically different from normal humans, so is The Voice a purely biological adaptation that a person could still use to some effect while speaking like an oaf?
gpt
It's simply a command of tonality, inflection, wording, sub-vocalization, and a host of other subliminal cues that acts as a sort of acute neuro-linguistic programming.

Basically, in the same way that "sad" music can evince an emotional reaction in you without you consciously having any reason to actually be sad, or a particular loud noise can trigger a fight-or-flight response, etc, a user of The Voice can use all the details of what they're saying to slip reactions in past your conscious mind. It's not mind-control, exactly, in that it doesn't compel you to do something that is manifestly against your own will; it simply makes you do something that you're not consciously aware of wanting to do, and aren't actively engaged in forcing yourself to *not* do.

IOW, when Jessica tells the ornithopter pilot to remove her son's bonds, it's not that he's being forced against all good judgement to do something that he in no way would ever be willing to do; it's that it feels, deep down, on a subconscious level, like removing the kid's bonds would be a fine and dandy idea right then and there.

edit: also, it should be noted that Bene Gesserit are, very much, biologically the same as "normal" humans; they're not mutants or anything. They've just been trained to control a lot of the things that we would normally never have any conscious access to, much like how an athlete might have much more control over aspects of their musculature or breathing than a "normal" human would ever experience.