It's good idea, but The terrain is "Instalation" so I haven't area town. In addition, many of the aliens units are Heros, and I don't know to "build Heros"
I am looking for a lot of sound of aliens, predators y etc.. but I don't find anything.
If someone know where I can go, please, tell me.

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that can be fixed. just have a trigger that automatically removes the regular unit and create a hero unit.
if u really want alien sounds just pm xeno, im sure he might want to help you.