I'm recording commentary over a video, and when I'm talking in the commentary I'd like the other channel's audio to get quieter to compensate for my voice. If anyone is familiar with discord, I know that when talking to people in a group chat it makes other programs quieter, if that helps make sense of what I'm trying to do.
I'm really inexperienced with video editing, but I have access to audacity, Adobe audition, and premiere. I'm also open to other programs (free or cheap) if they can do this easier.