Hey 🙂

It is the "Sonic Studio Virtual Mixer"

Download the latest audiodriver from Driverpage of your motherboardmodel.

Extract the files and run setup (Please remeber where you have extract the files)
If required, reboot your system. After reboot Realtek Installer finish the setup.

Now go in your device manager and right click of the unknown device and click
Properties.

Under the Tab Driver click Update Driver. Now you use the choice
""Browse my Computer for driversoftware" and go to the Folder where you Extract
the Setupfiles from your Audiodriver and click "Search".

Windows will automatically install the missing driver. After that in the devicemanager
you will see the unknown device is now listet as Sonic Studio Virtual Mixer".

Greetings
Jenny 😛