Hi, I'm also having trouble getting the 5.1 surround sound speakers working. I have the NU Audio Pro with surround card and everything is hooked up right and working. I can do a test via the EVGA software and through windows and all speakers work/hear test tones. However, whatever I play that has surround sound content (like the Witcher 3, etc.) - it does not play out of center and rear speakers - only stereo (front 2 speakers and sub). What am I missing? I also looked for the enhancements tab in Win10 sound settings and I don't have that tab. Should I have that if I now have this external sound card? I also noticed that in device manager I still have Realtek driver as well - tried uninstalling but it keeps coming back so I disabled it but still nothing. I've turned the surround option on also in the EVGA software but it didn't make a difference. Any ideas?
UPDATE: I was able to figure it out. Although I was uninstalling and deleting the Realtek drivers and then disabling it - I went through control panel this time and uninstalled Realtek from there and then I was able to turn surround on via EVGA software and now I have all speakers working (as long as its truly encoded 5.1 material - like Witcher 3 game, etc.). Hopefully this might help someone else out.