Trigger once event won't work properly

Hello. I was trying to make my game play a specific sound when the variable Handbrake=0 and the other sound when Handbrake=1. But it should be played ONLY ONCE. For some reason sound is only being played on Handbrake=1.

Thanks in advance

Okay, i've found out something. But that still doesn't solve my problem. It has to do something with the fact that i have 2 objects called "CAR", which are responsible for the variable HANDBRAKE. Adding the condition "FOR EACH" makes both of the sounds play... But one million times. Still need a solution

Remove the trigger once. Change the variable when you play the sound.

Remove the trigger once. Change the variable when you play the sound.

It's supposed to go through the variable. Many other things depend on it.

Use another variable.

Okay, i've found out. It's easy to handle via functions