Maybe this is just my phone (and laptop), but volume control is irritating when some tracks are configured so that I need to set the volume to 70-80% and some tracks are so "naturally loud" that the lowest setting (5% ish for my phone) is distractingly loud.

On some of my tracks (especially for the classical music ones), within the same track I need to change the volume from 20% to 80% depending on what part I am listening to if I want to hear everything without killing my ear drums.

I get that it would be difficult to do anything about this for streaming or live audio since the phone doesn't know in advance what the input will be, but for a pre-recorded mp3 file, couldn't my phone do some digital signal processing?

Do I just have terrible electronic items and is this an issue anyone else experiences? Ot is this problem just harder to solve than I am expecting?