I meant replace your existing action (Audio->Play jumping sound) with those 2 lines.
This is what you wanted, isn't it?
[quote:94xz1gbr]Don't play jump-sound if the jump-sound is already playing.
I didn't see your code and don't know where you play your sound. I'm guessing it's inside some event, maybe On collision with a floor, or On key "Up" pressed. So insert my 2 lines inside that event.