QUOTE(LegacyWeapon @ Jan 20 2005, 12:42 PM)
His is a bit more precise because it moves the location back on the unit the moment it leaves the location. Yours centers it (without hypers) every 2 seconds so if the unit moves fast, it will play the sound repetitively. With hypers, the wait might cause wait blocks and other problems, and again if the unit moves too fast, the sound will play repetitively. Bolt's and according to the tutorial, it will play the sound once everytime the unit leaves the location, and not any more.
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None of that matters if drakel puts the center location trigger before the second trigger, like he listed it. If he does it that way then you will never hear the sound because every time it checks to see if the zergling is in the location it JUST got done centering it on him.
The hyper trigger method with the wait would kinda work. Good enouth for most people to not be able to tell the differance of course.