Hi billystupid,
I have entered a feature request on your behalf indicating that the Real Time Audio controller is not necessarily intuitive to all users: JIRA [UE-26093]. If this feature is added in a future release of the Engine, we will notify you with an update to this post.
In the meantime, an easy way to remember how the controller works is:
- Volume on minimum with red “X” indicates only viewport sound is off
- Volume on minimum without red “X” indicates ALL sounds are off
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