Anyone have effect suggestions for distorting an audio recording of a voice so that it sounds like a monster? I use FCP, and will use Soundtrack if necessary. Something like Godzilla would be preferable, but any monstrous effect would be great. I'm sure it has a lot to do with the voice recording, but I can figure that out after I have an idea of what the effects can produce.

I depends what you are looking for. Do you want the words to be recognizable?

In STP i just applied vocal transformer, bitcrusher distortion and phase distortion & played around with each, turned some on & off & got some interesting results. - Time - 2 minutes.

Just start adding odd effects, you'll get something.

animal sounds slowed and layered with other sounds at different frequencies... usually also slowed down... what specifically are you looking for sound wise - will it contain speech? Does it need to be recognizable speech/ actor?

It has been claimed Godzilla's roar was originally a cello turned very low and bowed slowly, probably slowed down with echo as well. Later Godzilla voices seem to be different, something mechanical layered with animal sounds. Layering animal sounds that are slowed down really works, adding a physical sound, crackling paper, scraping metal, whatever, gives the sound an unworldly feel.