Hit Windows+R.
A "Run" window should open.
Enter

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REG ADD HKCU\Software\Mumble\Mumble\wasapi /v role /t REG_SZ /d console /f
to set the role to console (as per ERole docs: "Games, system notification sounds, and voice commands.")

or

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REG ADD HKCU\Software\Mumble\Mumble\wasapi /v role /t REG_SZ /d multimedia /f
to set the role to multimedia (as per ERole docs: "Music, movies, narration, and live music recording.")

To restore the default (communications role):

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REG DELETE HKCU\Software\Mumble\Mumble\wasapi /v role /f

To apply the changes make sure to restart Mumble (or the WASAPI instance by going into settings and pressing ok - should also work).