Scratch

I'm making a game with music in the background, but in the settings I'm putting an option where you can change the volume of the music, and so I created a variable called volume, which you can set to any number between 0 and 100, but is there anything wrong with this script?

<when green flag clicked>
<forever>
set volume to <{ volume }> %
<end>

Also, there wasn't the block for set volume to.