Your Rotel A12 states..
PC-USB USB Audio Class 1.0
(up to 96kHz 24bit)
USB Audio Class 2.0
(up to 192kHz 24bit)*
*Driver installation required
From the MoOde log...
Rotel may not provide Linux support for USB2.0 if they are specifying a driver required (Windows)
You could email Rotel and ask about Linux support. (Though looking via Google it seems that Linux shouldn't need any thing special for USB 2 and Rotel)
One thing to check...what USB ports are you using from your Pi4 to the Rotel ? USB2 or USB3 ? (Suspect it might be USB3) swap to the other (USB2) and reboot.
Tim or Kent may be along with more insights once their side of the world wakes up :-)
PC-USB USB Audio Class 1.0
(up to 96kHz 24bit)
USB Audio Class 2.0
(up to 192kHz 24bit)*
*Driver installation required
From the MoOde log...
Code:
ALSA cards: (0:b1 | 1:Headphones | 2:empty | 3:empty
20211218 021936 worker: MPD config: (2:Rotel USB Audio 2.0 | mixerSadRotel USB Audio 2.0 ) | card:2)
20211218 021936 worker: WARNING: No device found at MPD configured card 2
Rotel may not provide Linux support for USB2.0 if they are specifying a driver required (Windows)
You could email Rotel and ask about Linux support. (Though looking via Google it seems that Linux shouldn't need any thing special for USB 2 and Rotel)
One thing to check...what USB ports are you using from your Pi4 to the Rotel ? USB2 or USB3 ? (Suspect it might be USB3) swap to the other (USB2) and reboot.
Tim or Kent may be along with more insights once their side of the world wakes up :-)
----------
bob
bob