The Audio of NT331 is on the Left channel only. This is very bad listening to on headphones. The volume need to be turned up to hear clearly and then the low humming noise become audible.
Are you listening to the videos or the audio resource? I just played both and didn't have any of the audio issues you described. Have you experienced this with multiple different segments? If so, which ones?
Both audio and video all sections. I'll try to figure out why. It's only this resource that's doing this. The stereo system on my laptop does the same.
Here is the workaround for those that maybe encounter the same issue. For this resource to work I made the following settings in my sound properties. The audio seems to be mastered in 7.1 surround sound.
I don't have any audio issues with NT331.