Originally Posted by: rockonn91once we have that done, what you do it you is choke up on your pick and pluck the string in such a way that your thumb hits the string right after your pick. what happens is that squeal.

That will work. My approach is I'll keep my grab of the pick the same, but I'll rotate it with the tip going towards the bridge, hitting the string with more of the side of the pick while still achieving the simultaneous thumb contact. All these tips are dead on though: gain, pick and thumb strikes, location of both hands (some places are easier than others), and experimentation. The 1st one is the hardest...then it's just practice.