Great job and video. Many thanks for posting, it's a precious reference as , of course, I have the same issue with my pair of NS-1000M. With the time, several people just bypass the controls to quickly solve the audio quality downside, but you show the definitive fixing process. Top
I still think the best option is to bypass. The noble L-Pads are of the highest quality around, but.... still better to bypass and not have an extra component.