Does a 7.1 surround headsets works properly with the 5.1 sound for the pro members, either way connected to the controller or directly to the pc? HyperX Cloud Revolver, this model specific
You can't get 5.1 surround sound using a 3.5mm headphone jack, that is stereo only no matter how you cut it. The "7.1" on that model headset is just simulated using the USB adapter it comes with, it's still just a two channel headset. You won't be able to use the USB adapter with the Stadia controller. If using PC and Chrome, and that USB adapter is properly set up in windows to expose itself as a 7.1 (or 5.1) audio system, I believe Stadia should map the 5.1 channels as needed to the exposed channels that windows sees.
As for connecting the Stadia controller, you can plug it in a USB port or you can just use it wirelessly by punching in the Stadia controller code when prompted just like using it with a Chromecast.