Vagus stabilization button?

[Guest guest]

I have a potential buyer that wants to know why there are 3 separate

buttons for Sympathetic stabilization, parasympathetic stabilization,

and Vagus nerve stabilization. As her and I understand it, all three

are intimately connected to one another. So my question is what is the

Vagus nerve button doing differently than the parasympathetic

stabilization, since as I understand it, the vagus nerve is the main

communication apparatus for the parasympathetic system?

Also when one stabilizes the sympathetic nervous system why would it

not stabilize the parasympathetic nervous system, since they seem to

work in reciprocal fashion?