in some movies I see some criminals changing voice
And then calling someone on phone with false identity

Is it really possible to change the color of human voice
So good, to mach some other man

What vst would you use for this ?

well you will need some type of transformer or clever eq and pitch its not possible to emulate somebody's voice completely hence why most people just rip the vocal from the film instead

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When making ransom phone calls?

Please. stop. posting.

You have started one new thread of banal stupidity every day. They are hurting my eyes.

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I think what you are looking for is a something that can alter the pitch and formant of someone's voice

IRCAM Tools:

http://www.youtube.com/watch?v=fg00-4aUcWI

skip to 6:30