Hi, some other Roland UA-* cards are supported: - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/usb/quirks-table.h?id=14335d8b9e1a2bf006f9d969a103f9731cabb210#n510 - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/usb/quirks-table.h?id=14335d8b9e1a2bf006f9d969a103f9731cabb210#n1752 it is probably needed to add similar block of code for UA-4FX2. You may also try whether an existing "quirk" would work with your card - through quirk_alias: https://www.kernel.org/doc/html/v5.1/sound/alsa-configuration.html?highlight=quirk_alias#module-snd-usb-audio Franta
