Pulseaudio: ignoring Master

Hello!
According to https://era86.github.io/2017/10/03/asus-zenbook-3-volume-controls.html, I need to change /usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf.common to add this:

[Element Master]
switch = mute
volume = ignore

Can anybody point me in the right direction? Thank you!