(I'm about to travel home, so let me provide more context...)
rtav has absolutely nothing to do with Audio Out (Speakers listening to music etc)
those keys:
"AllowAudioIn"="false"
"AllowAudioOut"="false"
"ExcludeAllDevices"="true"
these ONLY apply to devices redirected by USB devices.
if you need to disable audio-out , i need to talk to some other folks to remind myself how best to do that.
the isDisabled for the rtav regkey should ONLY stop webcam redirection and microphone redirection. (please confirm if thats not what you are seeing)
pls confirm the use case.
cheers
p