this is usefull to some people who dont use spotifyu or youtube red because ads or something else
with amazon being the owner of twitch this only makes sense.. also perhaps as amazon prime lets you use your music for streaming ( drm free) as long as you are not a radio station and its for ambiance/ background that it could flag your account for not getting stream recordigns muted!!
should also be built into slobs as a separate input for audio so you can independantly control the volume .. without third party apps
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