Created attachment 304100 [details] dmesg Mackie Profx12v3 usb mixer not working, showing unable to find clock source
Created attachment 304101 [details] lsusb
did this work correctly on earlier kernel versions? if so: which was the latest where things worked?
Please try the following: modprobe -r snd_usb_audio modprobe snd_usb_audio vid=0x0a73 pid=0x0023 quirk_flags=0x20