Hi
Welcome to Microsoft community.
The 'Stereo Mix' option is used to record the output stream of your computer, and it can be used for routing sound. If you can't see 'Stereo Mix' in your sound settings, it could be because it's disabled, it's not supported by your sound card, or the drivers are outdated.
Here's how to enable Stereo Mix:
- Right-click on the speaker icon in the system tray and select 'Sounds'.
- Go to the 'Recording' tab.
- Right-click anywhere in the empty space and check 'Show Disabled Devices' and 'Show Disconnected Devices'. 'Stereo Mix' should appear.
- If 'Stereo Mix' appears, right-click on it and select 'Enable'.
If 'Stereo Mix' still doesn't show up, it's possible that your sound card doesn't support this feature, or you might need to update your sound drivers.
You can update your sound drivers by:
- Pressing the Windows key + X and selecting 'Device Manager'.
- Expanding 'Sound, video and game controllers'.
- Right-clicking on your audio device and selecting 'Update driver'. Then, select 'Search automatically for updated driver software'.
Best regards
Derrick Qian | Microsoft Community Support Specialist