Changing sound of a rock

[DnALANGE]

There is a much easyer way to do.
You can use PlaySoundAtEntitie for YOUR sound on a scriptarea where the stone falls on the ground.
Add a script area on the ground underneath the stone.
Add a collide function if the rock toutches the scriptarea add your PlaySoundAtEntitie( the script area underneath the rock).
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I hope this is what you mean, this is a very easy way ( altho you can still hear the Original sound as well, maybe not//