I really thought that Construct 2 would contain a global "mute audio" action. I was stunned to discover that it contains a plethora of audio actions but not a simple global "Mute/Unmute All". I struggled with this until I found Cipriux 's example above:
You can try changing the master volume or by tag. Instead of using dB I use this formula
I'm used to seeing code but missing hidden stuff out because a capx is worth a thousand images, so I really thought your solution was too good to be true. But, hey ho, it really is as simple as that! Just a variable and 2 lines of code! I had been struggling with this for hours so Cipriux thank you SO much!
I couldn't get any of the other proposed solutions on this page to do what I wanted but Cipriux nailed it