I'm a novice teacher and I'm recording my lessons to improve my teaching technique. My recordings have a lot of noise that comes from several sources: Air conditioning, chair creaks, traffic, etc.
The method that has worked best so far has been using notch filtering when I can identify limited frequency noises and then using noise reduction. This does help, but the results are still quite poor.
My knowledge of sound editing is almost none. Anyway, after a bit of googling I've come to the conclusion that this problem is called vocal isolation. If I'm getting it right, there is no real solution for this, just some tricks that can help a bit, so I guess that's what I'm looking for.
I have checked Audacity's tutorial on Vocal Removal and Isolation, but this doesn't seem helpful for me because my recordings are mono and that tutorial talks about stereo tracks.
So, can you recommend some method, plug in or tool that can help?
I attach a sample: