Yes I did, but it didn't work.
SOLVED? (I'm not sure if it's a stable solution)
I just added another event:
Hero > Platform is on floor >> Set animation to "Idle"
And it works... I mean, it make sense in a way but I didn't imagine it will be so complicated just to deal with the audio, I didn't even start with the real complicated stuff.
I'm not sure if that's the best solution, I will have to test it in more situations but for now it's not repeating unless I'm jumping lots of times into a really low platform so it repeats and get higher volume...
Now I'll need to see how I solve the same problem... with different thing like "Shot" animation, because what if he is ALREADY touching the floor... it won't work, only if he shots while jumping.... that's why I think this "SOLUTION" is not good.
Anyways, Thank you so much for taking the time and helping me in this, it's the best way to learn different solutions, you are very kind and I appreciate it.
Anybody who have example files with less events to keep it simple, I'll be happy to download and explore it to see how you solve this issue.