I needed to process a voice to sound “evil” but how to do it? So after a little internet research this is what I found….

Pitch shift it down and slap a slight ring modulator on it?

Use Antares’ Mutator – I got it on special offer from audiomidi.com for $10

Reverse your voice clip then apply a long reverb to it, then reverse it again..

Pitch shift the voice down (not too much). Then, apply the reverse reverb trick, keeping your printed reverb separate (record only the reverse wet signal). Pitch the reverb down a bit more. Bring everything back forward and mix up that satanic reverb to taste. Try treating the voice and its reverb differently. I find that creates unsettling effects very fast.

If you have H-Delay from Waves it has a preset named something like Evil

Use the pitch shifting and using reversed verb pitch down it’s very effective also added ultra short delay with feedback to give it metallic quality and lo-fi to break it up bit.

Try GRM Tools.

What works for you? Please post your tricks as comments to this thread.