I'm not sure how new you are so I'll start from the start.
You said you want a 3d sound played on the unit, but you also said you want the "double kill" sound.
Im assuming from dota? This sound is not a 3d sound, but a sound that plays to all players in the game,
regardless of distance. A 3d sound is a sound which plays at a point, and the further you are away from
that point, the quieter it is. E.g. All the attack sounds in a battle are 3d. So did you want a sound that
plays to everybody or just at a point?
Anywho, some examples:
This is a normal sound which plays when a hero dies. Every player can hear this across the map.
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Normal Sound
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Events
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Conditions
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((Triggering unit) is A Hero) Equal to True
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Actions
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Sound - Play CreepAggroWhat1 <gen>
This is a 3d sound which also plays when a hero dies. You can only hear it if you are viewing the
point at which it is played. The further you are from it, the quieter it is.
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Three D Sound
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Events
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Conditions
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((Triggering unit) is A Hero) Equal to True
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Actions
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Sound - Play FootmanPissed2 <gen> at 100.00% volume, attached to (Dying unit)
Note: A 3d sound
must have "3d sound" option enabled within the sound editor. A normal sound
must NOT have "3d sound" option enabled within the sound editor for it to work correctly.
Also, the "double kill" sound is a custom sound (not found in the warcraft 3 editor). You need to download
this custom sound. I'm not sure where, you'll just have to search the net.