I have a hard time hearing the noise of this emote. Without the distinguishing sound it looks more like the slap emote than a high-five. If there are no other noises around, I can hear it (although it's still faint), but if there are more people around or any other sounds it's not audible at all to me.
All I'm suggesting is just to increase the volume on the sound. It's currently my favorite emote and I want to hear it! :D