So the "playback rate" only can be applied to all sounds using the same tag? :S .
I guess there will have some trick or event we are missing.
Apply X effect to all sounds or use various tags for the same sounds will work for me.
So i can have all sounds with Sound(ID) + Music or Sound(ID) + SFX tags. So i can use the id to identify individually, or SFX / MUSIC if i want to apply to a specify group of them, this will be a lot of useful for organize and use.