Ensure you have the Conexant SmartAudio HD driver installed. You should see it under Sound, Video and Game Controllers in Device Manager. With the Conexant driver already installed and working the key is finding the exact location of the driver file. It might vary from one computer to another and also be called something else. Mine was called chdrt.inf and it was located in:
C:\Windows\System32\DriverStore\FileRepository\chdrt.inf_amd64_neutral_fa34defac299c440
If you are not sure where your .inf
file is located you could do a windows search for text in files of the string:
EpSettings\StereoMixEnable
. It will most likely be a file with the extension .inf and be located in a sub folder
of the System32 folder.