you have a video of michael jackson talking with a deep voice?
There's the song "2000 Watts." This is literally the only song where he's ever sounded like this.
I've read stories from people who were around Michael and he would switch up his voice. Spike Lee was at the shoot for "They Don't Care About Us" and some guy in a deep voice was asking him how long it was going to take. Spike turned around and was like

when he found out it was Michael.
Another time, Michael was in a meeting with some executives and a few other people. He was just nodding along to everything they were saying and it looked like he wasn't paying attention. As soon as they left, he was like, "Damn, I thought those motherfukkers would never leave.

"
Lisa Marie heard his real voice and she didn't understand why he kept using his soft voice in public.