I remember watching a blind man teach a group and he had in one earbud to his phone and was just using his thumb to flip back and forth quickly through his notes as he was speaking, and taking comments and questions. I was impressed at the multitasking. I don't think I could listen to two different things so well, or talk while also processing audio notes.
Humans can get good at most things pretty quickly. You have no skill at listening to two audio tracks at once because you’ve never tried. You’ve never tried because you have no need. If you were blind, or a forensic audio analyst, or a music producer, you’d get pretty good pretty quickly.
