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some clarification is due on the new keyword usage, iif you care for your class-compliant USB-Audio soundcard prioritization, specifically:

1. add the snd-usb keyword to RTIRQ_NAME_LIST on the existing configuration file (/etc/rtirq.conf) or accept the new default, as follows:
   RTIRQ_NAME_LIST="snd snd-usb i8042"
2. (optional) to cope with (hot-)pluggin in or out the stuff, you'll probably need a new udev rule; depending on your particular distro, the following will do:

cat<<_Eof1 | sudo tee /etc/udev/rules.d/99-rtirq.rules
ACTION=="add|remove", SUBSYSTEM=="sound", KERNEL=="card*", RUN+="/usr/bin/systemctl restart rtirq.service"
_Eof1

hth.
cheers