Special effect - guru's help needed

Well, i've just done some nice models in 3DS... for example... an animated rocket that's falling on the ground and do a nice explosion. And i don't want to add too many objects, and place them as Special Effects one at a time (using triggers)... So, i've made all the animation in one .mdx.
My real problem is... i couldn't find anywhere a way for the hero when using that spell the animation to be played from start. I mean, whenever i use create special effect in triggers... everytime the animation is played randomly... and i don't really get it. Why ? Is there a hidden Jass function.. or something, so that when a hero starts using that spell, the .mdl to be created from start ? This is what i am using:

Special Effect - Create a special effect at (Position of trgt2) using Units\Extra\Atomic.mdx

To explain better... sometimes the nuke (start of the animation) appears.. fall down (middle) then explode (end). And sometimes first it explodes.. than the nuke appears... then fall down... Or first fall... and so on. Please experts help... i don't really get this.

well....i know for the units, u can set the required animation...baahh, i can't remember the name....search the actions for "animation" and u'll maybe find it...as for special effects, u can hope it works :))

Why are you creating a special effect? Why not just edit the spell art or buff art to make it use your model? If you create a special effect, you HAVE to delete it, which can be difficult without jass