Still hear sounds when Volume is 0

When I “Set Sound Mix Class Override” volume to 0, I still here my SFX. When I set “Fade in Time” to 0, I still hear the SFX but only a second of it then it goes mute like it should. How can I make it all be mute from the beginning of the SFX clip. The SFX clip length is very short. Its a bubble pop SFX. I think it a bug with the “Fade in Time” on the “Set Sound Mix Class Override” node. I have attached the game if anyone would like to see it.link text Thanks for any help!