diff --git a/sound/usb/implicit.c b/sound/usb/implicit.c
index e1bf1b5da423..f3e8484b3d9c 100644
--- a/sound/usb/implicit.c
+++ b/sound/usb/implicit.c
@@ -47,6 +47,8 @@ struct snd_usb_implicit_fb_match {
 static const struct snd_usb_implicit_fb_match playback_implicit_fb_quirks[] = {
 	/* Fixed EP */
 	/* FIXME: check the availability of generic matching */
+	IMPLICIT_FB_FIXED_DEV(0x0763, 0x2030, 0x81, 3), /* M-Audio Fast Track C400 */
+	IMPLICIT_FB_FIXED_DEV(0x0763, 0x2031, 0x81, 3), /* M-Audio Fast Track C600 */
 	IMPLICIT_FB_FIXED_DEV(0x0763, 0x2080, 0x81, 2), /* M-Audio FastTrack Ultra */
 	IMPLICIT_FB_FIXED_DEV(0x0763, 0x2081, 0x81, 2), /* M-Audio FastTrack Ultra */
 	IMPLICIT_FB_FIXED_DEV(0x2466, 0x8010, 0x81, 2), /* Fractal Audio Axe-Fx III */