To apply a sounds scheme, the appropriate action is:

However, the event sounds will still play, and that is because the selected scheme has not been applied. This will (technically) set the selected scheme, which you can verify by going to your Sounds settings and see that the No Sounds scheme is selected. None: New-ItemProperty -Path HKCU:\AppEvents\Schemes -Name '(Default)' -Value '.None' -Force | Out-Null So you can set the selected scheme by changing this to. The selected scheme is at HKEY_CURRENT_USER\AppEvents\Schemes, which defaults to.

None you can see this by exploring HKEY_CURRENT_USER\AppEvents\Schemes\Names. However, you then have to apply the new scheme, which is a bit more involved.