I can think of at least one way of doing this. It's probably a bit hard, but it's possible with filters and audio effects in software such as Adobe Audition. I've recorded my own voice on several ocassions and worked with turning it into radio chatter - works like a charm. However, I think turning it into a Slig's voice might be a little harder. You're going to have to pitch it, lower the quality, chamber it (they have masks, after all) and probably add some kind of noise filter to it. I've never thought of doing this, but I might give it a try at the end of the week. Good thinking!
~Adventure seeker Killy in the Cyber Dungeon quest!
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