Is the spatial audio for stereo speakers feature still in alpha?

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No, you cannot use Stereo Mix if you have no speakers. Stereo Mix is a feature in Windows that allows you to record audio output from your computer. This means that you need to have speakers or some other audio output device connected to your computer in order to use Stereo Mix.

I have speaker audio as: HDMI audio - stereo uncompressed; Optical audio - Bitstream out; and Bitstream format - Dolby Digitial. My headset audio is: Headset format - stereo uncompressed.

Yeah, I tried all of that, nothing works. Switching between audio formats makes it glitch and waiting a second resets it but it still only works on stereo and 5.1 but the Atmos works FINE on movies, Dolby App etc. Atmos works, just not in games. Its clearly
an Xbox issue.

Troubleshoot settings

In-game audio issues when using Dolby Atmos:

If you experience audio problems when you’re using Dolby Atmos, try turning it off:

1. Press the Xbox button to open the guide and select System >
   Settings.
2. Select Display & sound, then from the headset audio options, select
   Stereo Uncompressed.

Frozen speaker settings after you disconnect a Windows Sonic or Dolby Atmos headset:

In most cases, disconnecting or turning off a headset/device configured for spatial audio (Windows Sonic or Dolby Atmos) will return the speakers to their previous audio settings. However, certain hardware—such as wireless headsets using an intelligent transceiver
plugged into USB—might still show the headset is connected even after it’s disconnected or turned off.

Unplug the headset or the headset component attached to the Xbox. This should immediately return the speakers to their previous configuration without changing the headset or speaker audio settings. Plugging the headset or the headset component back in should
restore the headset format you’ve chosen.

If you’re still having problems switching between speakers and headset on Xbox One, check the headset/speakers manufacturer’s website for more info.

Let us know with a reply how it goes!

Are you using the onboard speakers or something else? Do you have anything like Dolby Atmos or DTS installed? Do you have windows spatial, audio enabled?

Troubleshoot settings

In-game audio issues when using Dolby Atmos:

If you experience audio problems when you’re using Dolby Atmos, try turning it off:

1. Press the Xbox button to open the guide and select System >
   Settings.
2. Select Display & sound, then from the headset audio options, select
   Stereo Uncompressed.

Frozen speaker settings after you disconnect a Windows Sonic or Dolby Atmos headset:

In most cases, disconnecting or turning off a headset/device configured for spatial audio (Windows Sonic or Dolby Atmos) will return the speakers to their previous audio settings. However, certain hardware—such as wireless headsets using an intelligent transceiver
plugged into USB—might still show the headset is connected even after it’s disconnected or turned off.

Unplug the headset or the headset component attached to the Xbox. This should immediately return the speakers to their previous configuration without changing the headset or speaker audio settings. Plugging the headset or the headset component back in should
restore the headset format you’ve chosen.

If you’re still having problems switching between speakers and headset on Xbox One, check the headset/speakers manufacturer’s website for more info.

Let us know with a reply how it goes!