Hello rihardslusis2
Can you please confirm if it is the popping sound or the default 'ding' sound that comes up every time you change the volume level?
Meanwhile, please ensure that it's the master volume you're reducing to zero and not the volume for any other app. You can right-click the speaker icon from the notification area, click Open Volume Mixer, and make the appropriate adjustments from there.
Hope this helps.
Cheers!!