this is a old interview (2009) with infected mushroom. Infected Mushroom Sound Alchemy - Audiofanzine
They explain a little tip how get this kind of sound :(u can listen in url)
AF: At 1:00 you have some effect on the voice. How do you make this kind of sound on the voice?
Eisen: Basically, we cut every syllable of the word. Let’s say “I feel ashamed”, we cut the “I” and then in the word “feel” we just cut the “f”, the “ee”, and then the “l”. For example, only the “ee” of the “feel” we trigger that one. A really small trigger until we get the pitch, the note that we want.
AF: Yes. Because when you do a loop on it makes special harmonics.
[Editor’s Note : the sound is tuned depending on the length of the loop : frequency (in Hz) = 1 / period of the loop (in seconds) – example : To reach a 440 Hz “A” , your loop has to be a multiple of 2.2727 milliseconds]
Eisen: Yeah. When it’s really short you get these special harmonics. So you need to know the length of the loop that you are doing until you get the right pitch. Basically we do this on every syllable. On “ashamed” there are a lot of them. Usually, on the “s”, the “t” and the “d”, the beginnings of words, the consonants, we keep, we don’t touch them, and only harmonics sound we trigger. It takes a lot of time.
My doubt is, how to apply this techniq? I try but unsucessfull.
If someone can explain correcly.