I'm running a 2010 Mac Pro with OpenCore (via OCLP 0.4.3) and UEFI dual-booting macOS and Windows 11 21H2 (22000.652) - so the latest version. I disabled Secure Boot, Driver Signing, and Defender, then followed these instructions, and I was able to get DDL and DTS Interactive showing in Realtek HD Audio Manager, but it's not working properly in games like Overwatch. I only hear sounds from the Front-Left and Front-Right speakers. The last time it was working properly was probably around early February when I was running Windows 10 on this same machine via a manual install of OpenCore (not OCLP).