The only required change is to extend the existing Xonar U1 mixer quirks to the U3, which seems to be controlled the same way. --- sound/usb/mixer_quirks.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c index ae2b714..2223089 100644 --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -1107,8 +1107,9 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer) err = snd_ftu_create_mixer(mixer); break;

- case USB_ID(0x0b05, 0x1739): - case USB_ID(0x0b05, 0x1743): + case USB_ID(0x0b05, 0x1739): /* ASUS Xonar U1 */ + case USB_ID(0x0b05, 0x1743): /* ASUS Xonar U1 (2) */ + case USB_ID(0x0b05, 0x17a0): /* ASUS Xonar U3 */ err = snd_xonar_u1_controls_create(mixer); break;