Technic,
I read that and I guess I don't understand the terminology here.

I interpret normal or natural to mean....a voice that does not fall under the sweet or mega or live in this case ie., this is our harmonica sound that isn't sweet, live or mega. If that is the case.....then there would have to be normal or natural or standard sounds on the Tyros....because they are different from previous PSR's, I do not think that makes them mega, live or sweet.There is apparently a limited number of those types of voices on the Tyros.
So if all of the above is true.....then what are we to call the voices that do not fall into the sweet, mega or live catagories?
I don't think George's post (through Mark)helped to clear that up at all....the harmonica he mentioned has to fall into being called something, which I would assume is a "normal" Tyros sound.
Terry