I have a phone record with two persons speaking, let's call them A and B. A is very quiet on the record, B is "normal".
Now I want to amplify the voice of person A so that it matches the loudness of person B. How can that be done?
Note that I don't care about noise or whatever, I need no filtering, I just need to amplify the voice of person A.
Please note that it is a longer record, so I need an automatic solution, amplifying person A manually would take hours.