I always encounter this issue… I am not sure but 0 was suppose to mute the music right 
?..but still this action play the music in 100 level…even If I set it to 15 or 20…the volume doesn’t change
use play a sound or play a sound on a channel instead of play a music.
see Audio [GDevelop wiki]
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I believe 0 is supposed to mute the sound.
While you should still probably use “play sound on a channel” events, I’ve now tested this and you definitely have something else going on.
This event works fine for the music being muted.
https://game-previews.gdevelop-app.com/1642826405644-315596/index.html
Here’s with the “Play music on a channel” action as well, just to test
https://game-previews.gdevelop-app.com/1642826788517-504534/index.html
Yeah its working for me too… but it happens randomly sometimes…and I just realized this are all happening to old projects made with Old version of Gdevelop…maybe that’s causing the issue…haha my bad