(acappella 01:28)
"How can we preach, when all we make this world to be
Is a living hell torturing our minds?
We all must unite, to turn darkness to light
And the love in our hearts will shine"
This part shows MJ singing in his lower register, similar to parts in 2000 Watts. Also, don't forget MJ's voice acting as the Major in Ghosts.
I do agree however, in my opinion, that the vocals (or part of them) have been tampered with slightly. Obviously some sort of filter effect over the vocals, as well as maybe a lowered pitch/speed. Certain parts of the vocals just do not sound natural. I know Mikes lower register vocals, and some of them are just too much.
Just listen to the 2000 Watts acappella here on the word "Deaaal": (0:49)
An edit with a slightly higher pitch/speed to the song, makes it sound more natural and closer sounding to the vocals of Shout:
Now, could Michael actually go down low as in the released version of 2000 Watts? He probably could by exaggerating like we all can, but it would still not have that slightly "altered" sounding tone to it, and he might not have been able to sing a whole song like that, in my opinion of course
It's easy. A males voice can vary so much throughout the day from right after waking up where it is really, really deep, until evening/night where it is lighter. A voice can also lighten a lot after exercising (dancing in Mikes case). It can lighten if someone is nervous or tense/shy. Mike obviously was very shy in his public appearances, most of the times, so it was obvious that he would adopt the light voice manner when in public.
It might have also been from his childhood where he would be quiet and hold his voice because of his fear against his father, and the only way he would "let out" his "inner" voice was through actually singing - or when he felt at most comfortable in private.
So many variables to the voice thing. I can have the deepest manliest voice ever some mornings, yet can sound like I am speaking from my throat in the evening after a gym session where I almost have to madidate/deep breath in order to lower my voice
My opinion on this is that Michael DID have a deep manly voice (similar to This Is It conference), it's just that as soon as he was not feeling 100% comfortable, he would switch to the light one. Also, an argument made is that he also used the lighter voice often in order to not strain his vocal chords.
No idea if this is true or actually works though.