I've been using relive to record instant replays for a few months now, in general it works great.
Recently I noticed that my videos weren't recording any gameplay sounds, but I was able to hear sounds from my microphone. When I looked at my Audio Capture Device in the global settings, I saw that it was capturing my microphone channel. When I attempted to fix it, I discovered that it was only detecting microphones, and not speakers.
How can I refresh the Audio capture device lists? Reboots haven't fixed it.