phaser3 Problem width watching data between create(), and update()

[MEJS]

Hi all I have small problem. I have an spritesheet and background music, when i click on my sprite the music should be muted and I want to achieve this by watching variable named musicMuted.  So when variable is false then music should play, else not. The problem is that when I change the variable in create function it is not updating i update function (always return false)

Codepen below: https://codepen.io/mejs/pen/mdyeGjo