A long time ago, I had a music player for windows, which had separate volume control for each track, in 10% steps. With that I could make tracks match volume the best, while of course being a bit of manual effort involved. But one could do it iteratively, when one noticed it was too low or high volume on a track, compared to the others. The player was probably not so good in other regards, but I remember using it for quite some time. It was called Ashampoo media player or similar.
