This missing sounds and music in Launcher is not a bug… it's a feature. Unlaunch applies these non-optional patches to the "Launcher" once installed. If you replace "Launcher" with TWiLight Menu++ (again: see https://dsi.cfw.guide/) you can customize almost anything. Theme like DSi Launcher, like 3DS Home Menu… with music, without. Whatever you want.Thank you so much! It worked, I almost lost hope and it's been like that for months!
Although now the music and sound on the home menu is gone, but games and apps, and setting have their sounds/music. It puzzles me what could have caused them to disappear