I've tried rolling back, updating, updating firmware... There's no option for mono-channel anymore. If I can't set my microphone to mono in windows or via Universal Control, there's no way for me to record high-quality audio via shadowplay (Nvidia Share). If I really wanted to I could use third-party software every time I record, but that defeats the purpose of shadowplay in general!
If anyone knows how I can set my microphone to mono via windows or universal control, please help!