I have an USB headset (Plantronics Rig 500 HD) with a microphone on Windows 10. The microphone can only be configured for 2-channel (stereo) sampling in Windows sound controls. When I use programs like TeamSpeak, Discord, or Audacity the audio is clear and understandable. When using non-primary-audio programs, like computer games, I have been told that the audio is distorted, and that my voice sound "demon-like".
If I go into Audacity and change the recording mode to mono, the recording does indeed become distorted in such a manner.
My hypothesis is that some programs somehow simply acquire a mono input from the microphone (which is distorted) rather than the correct stereo input.
I already use Equalizer APO with Reafir plugin to increase my mic volume (USB headsets microphone are notorious for low mic volume), and to eliminate noise. I have tried disabling Equalizer APO but that changes nothing. I tried adding the two stereo channels to L and eliminating R to get mono on L; however, the result is distorted. Each individual stereo channel L, R seems "complete" and clear by itself though.
How do I get non-distorted microphone recording for all applications?