Just to answer to Mike's question why people could prefer the "Hard" touch settings.
We want the volumes between the notes to be less noticeable.
E.g with a soft touch setting the first note we are playing is in volume 100, next note is in volume 85,next 90,next 95,next 80,next 100 etc.
We prefer the "gap" between the volumes of the notes to be smaller.
E.g from 90(ultra soft) to 100(ultra hard).
I have used those numbers just as examples.
With the same voice touch settings, different voice combinations will give different results because of their effects and require slightly different playing even when you are playing the same melody part of a song.
E.g first verse with the voice combination A and second verse the voice combination B.
Also in slow tempo songs you want more expression and it's easier to handle the dynamics of your fingers,
while in fast tempo songs too much ups and downs in dynamics sound like you are messing up with the volumes of the notes.
That is what John is facing I think.
That button it's a really "tricky" thing!! I am not used to it either