Bookbinding is currently my primary crafting hobby.
Many books are cut and in need of alignment and edge smoothing via sanding.
I use a belt sander and various, simple jigs.
Mostly it is a process done by hand, and ultimately I have to trust my eyes for the end result.
This is one of my least favorite steps in the process because it is time-consuming and difficult to get right.
For music I listen to retro video game music from the 16-bit era.