I think I figured this out. What I'm guessing is the problem is that the Stereo Mix uses Realtek drivers while I connected my HDMI to my NVIDIA Graphics card. I played around a bit and came to the following conclusion:
I needed to get the "speakers" playback device enabled so I put in a 3.5 mm...
I've tried that and set the microphone input to Stereo Mix but I get nothing but a flat line. If I play a youtube video or something, the sound bar in the recording devices window for Stereo Mix doesn't do anything.
I've been attempting to screen capture with Ice Cream Screen Recorder and each time, it doesn't record the audio from the computer. I thought maybe the software settings were off, but it was enabled to record the audio. I looked at my recording devices and noticed that I had 4.
(my...