Hello there 
I’m trying to play a custom sound when jumping in my game
The issue is that I made a script for it that don’t work in the said game, does not play at all no error nothing.
But the exact same thing with the exact same sound work on another game I made
I tried looking the volume switching the code a bit making sure everything is correctly linked but nothing even works and I can’t figure out why in this game specifically the jump sound doesn’t work.
It’s more efficient to directly just copy and paste the RbxCharacterSounds script into StarterPlayerScripts and modify the jumping part of it, you should try that.
What if the roblox base jump sounds don’t play on my game either 
see if the default player jumping sounds work, if not theres probably a deeper issue u need to fix.
Make sure it is parented correctly.
it might be because the jump sound might be interfering with the other scripts
How can I see which script make this break easily?
add print statements, see what triggers and doesn’t.
Are you sure it’s not an issue with your volume or anything?
Have you edited the jump sound with a server-sided Script. If so, you can’t, as the jump sound is made automatically with a LocalScript when starting a game. You either need to change the jump sound with a LocalScript, or directly change it from the RbxCharacterSounds script.