Your Music directory is really /storage/emulated/0/Music, but Android hides the first part in some situations.
Set List Maker saves links to recordings relative to the Recording Directory, if that's set. Looking at your troubleshooting info again, I think you had that set to /storage/emulated and linked a bunch of recordings, then you changed that to /storage/emulated/0 at some point and then just now to /storage/emulated/0/Music. In the last two cases, the recordings you liked earlier will not be found because the base directory has changed. Typically you should set your recording directory initially, then only change it if you want to move your recordings to a different location on your device.
At this point, you could change the Recording Directory back to /storage/emulated/0 as it was when you were linking most of your recordings, or you could leave it at /storage/emulated/0/Music and relink the recordings so they will be relative to that directory. Leaving it at /storage/emulated/0/Music would be better in the long run.