I mixed and recorded live to 2 track tape. So I cannot adjust individual instrument tracks. But before I hand off my tracks to a mastering engineer, I want to make sure I have any edits in place which I need to do myself. For example, I have a song where I feel the bass could be louder on some parts. Should I EQ that part of the track myself or expect the mastering engineer to do it? What is expected of my finished mix?