I have a lot of audio interview recorded on a smartphone where the interviewer is a woman holding the recorder and the subject is a man across a table. So the woman's voice is too loud and the man's is too quiet. (And there are many segments where the woman talks over the man.) Are there tools or tricks to balance this out?
(I tried a simple low-pass filter and that helped a tiny bit, but there are overlaps in the vocal frequencies, so I can't pick a filter frequency or crank it enough to make a significant difference without too much voice distortion on both speakers.)