I FIXED IT - the problem was the mute/unmute function on sound.
I figured out how to use an "if function" as stated above
[attachment=1:1px1ezy6][/attachment:1px1ezy6]
Now the sound is really muted on all layout and no random play.
The only is i dont know why on chrome sometimes i dont have sound .... music is working and the file format is correct too!
I have added the fixed construct file.
Edit: On my main project i have addet it now as sub event not as condition!
Like this:
[attachment=0:1px1ezy6][/attachment:1px1ezy6]
Hope this helps everybody having the same problem