And if i forgot to mention my actor id child actor. can it be problem ?
I have absolutely no idea… the only things I can suggest are :
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Try making a really cut down version in a new project and see if it works. ( just the struct and variable )
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If that doesn’t work zip it up and I’ll take a look…
ah…could be… 
with child actors you often can’t set variable before runtime, you have to set them with BP at runtime…
So mean i put little delay than set value on chile actor ?
Just right on begin play I think you can set the child actor variables.
I think there is something wrong with my engine.
i’ll use switch on enum or something to play sound as play sound on location works fine.
Sorry for headache.
Thank you for such a great response.
No worries!
I tried with both variable type sound wave and sound base. still same.
!!!SOLVED!!! @ClockworkOcean
I verify my engine, it did download something but didnt help with my problem.
Then i tried setting value as you said before but in construction script. Guess what, IT WORKED.
I was exhausted and i didn’t think to try construction script as begin play.
Again Thanks for Help.
Cool… and strange…