Jim Gillette is faking it...

He's gotta be! No way in hell I can believe that's what his singing voice sounds like with so many mods over it. Even harder to believe it when I hear his voice in an interview.

Does anyone here know where to find some live footage of Nitro playing a gig? If it turns out he's editing, I'm going to try and replicate the effect for my own voice. If not, I'm going to go buy some helium to huff when I next practice.

Funky c, Funky do
I doubt his voice was altered after recording in any way. It's not like he's the absolute best singer in the world or anything. Plenty of people could do what he did. If they can do it without effects, then why not him?