I need that squeky overtone sound. i know that i have to do something with the pick but i don't know what please help me.
search pitched harmonics lesson
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put part of your thumb on the string when you pick....not so much that it mutes the string,but enough to make the pinch harmonic
i dont have AD.....ooo,shiny
Pinched harmonics.

Basically try and very slightly catch the string with your thumb as you pick it. Might take ages to get used to, it did for me.
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Yea search Pinch Harmonics or Artifical Harmonics on Youtube. Pretty simple once you get the hang of it and find the perfect place between the pickups. Remember Gain is your friend!

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Do you mean the dimebag squeal?

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Yeah, for some people pinch harmonics are easy, for others its very hard. I'm still not very good at it.
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