Why does Shadow Play only record system audio through "Speakers (NVIDIA RTX Voice)" if it is installed?

Question

Audio

I welcome everyone. I set RTX Voice exclusively for the microphone, but for some reason when recording video, Shadow Play does not want to record system audio from the standard Realtek speakers. I don’t know how to describe it to you, but the sound is jerky and not at all. And as soon as I change the audio output to "Speakers (NVIDIA RTX Voice)", the sound on the recording becomes normal. Here is an example: https://youtu.be/ThEfngOKZ24

You ask why this option does not suit me? Because, sometimes it happens, Nvidia AI muffles the sound for me, although I removed the noise reduction from the output. And, if I turn off the sound through "Fn", it does not turn off, since I turn off the sound on "Speackers (NVIDIA RTX Voice)", but the sound is output through Realtek ... Please tell me, is it treated at all? Thanks