That's the Realtek HD audio driver. Don't know why they call it codec, maybe because that includes several sound systems. While installing it, I saw names like MAXX and Yamaha which led me think about MIDI and other music related things.
After having uninstalled the previous drivers and rebooted, Windows7 installed a generic HD audio driver from 2010. The downloaded one changed the name to Realtek HD Audio and is from 2017. The Realtek Control Manager is in the Program Files\Realtek\Audio folder but I can't get it to open. Sounds work, though, and the Windows tools even let you set the amount the channels, test them and even add the environment effects (sewer, bathroom and other echoing places).