Did anyone ever resolve this problem? l have the same problem. Literally happened overnight. Apple DLSMusicDevice is nowhere in sight. I'm running Big Sur 11.2.2. BIAB 2020 (421). I've tried all the suggestions with no joy.


BIAB 2020 Mac Audiophile
Logic Pro X

iMac Late 2015, Retina 5k, 27-Inch
macOS Monterey v12.4
Proc 4 GHz Quad-Core Intel CORE I7
RAM 40 GB 1867 MHz DDR3
AMD Radeon R9 M395X 4 GB

Apogee Element 88