You need to fix usb-audio.conf
speaker-test -c2 -t wav -D iec958:CARD=ed
works as
speaker-test -c2 -t wav -D hw:CARD=ed,1
You need to fix usb-audio.conf
speaker-test -c2 -t wav -D iec958:CARD=ed
works as
speaker-test -c2 -t wav -D hw:CARD=ed,1