diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index e90daf8cdaa8..638e7f738018 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -807,6 +807,7 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 {
 	switch (cval->mixer->chip->usb_id) {
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
+	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 		if (strcmp(kctl->id.name, "Effect Duration") == 0) {
 			cval->min = 0x0000;
 			cval->max = 0xffff;
diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index 0e2ed3d05c45..cc2dd1f0decb 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -379,6 +379,10 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
 		.id = USB_ID(0x0763, 0x2030),
 		.selector_map = c400_selectors,
 	},
+	{
+		.id = USB_ID(0x0763, 0x2031),
+		.selector_map = c400_selectors,
+	},
 	{
 		.id = USB_ID(0x08bb, 0x2702),
 		.map = linex_map,
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 15520de1df56..497d2741d119 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -637,7 +637,7 @@ static int snd_nativeinstruments_create_mixer(struct usb_mixer_interface *mixer,
 }
 
 /* M-Audio FastTrack Ultra quirks */
-/* FTU Effect switch (also used by C400) */
+/* FTU Effect switch (also used by C400/C600) */
 struct snd_ftu_eff_switch_priv_val {
 	struct usb_mixer_interface *mixer;
 	int cached_value;
@@ -1029,32 +1029,45 @@ void snd_emuusb_set_samplerate(struct snd_usb_audio *chip,
 	}
 }
 
-/* M-Audio Fast Track C400 */
-/* C400 volume controls, this control needs a volume quirk, see mixer.c */
+/* M-Audio Fast Track C400/C600 */
+/* C400/C600 volume controls, this control needs a volume quirk, see mixer.c */
 static int snd_c400_create_vol_ctls(struct usb_mixer_interface *mixer)
 {
 	char name[64];
 	unsigned int cmask, offset;
 	int out, chan, err;
+	int num_outs = 0;
+	int num_ins = 0;
 
 	const unsigned int id = 0x40;
 	const int val_type = USB_MIXER_S16;
 	const int control = 1;
 
-	for (chan = 0; chan < 10; chan++) {
-		for (out = 0; out < 6; out++) {
-			if (chan < 6) {
+	switch (mixer->chip->usb_id) {
+	case USB_ID(0x0763, 0x2030):
+		num_outs = 6;
+		num_ins = 4;
+		break;
+	case USB_ID(0x0763, 0x2031):
+		num_outs = 8;
+		num_ins = 6;
+		break;
+	}
+
+	for (chan = 0; chan < num_outs + num_ins; chan++) {
+		for (out = 0; out < num_outs; out++) {
+			if (chan < num_outs) {
 				snprintf(name, sizeof(name),
 					"PCM%d-Out%d Playback Volume",
 					chan + 1, out + 1);
 			} else {
 				snprintf(name, sizeof(name),
 					"In%d-Out%d Playback Volume",
-					chan - 5, out + 1);
+					chan - num_outs + 1, out + 1);
 			}
 
 			cmask = (out == 0) ? 0 : 1 << (out - 1);
-			offset = chan * 6;
+			offset = chan * num_outs;
 			err = snd_create_std_mono_ctl_offset(mixer, id, control,
 						cmask, val_type, offset, name,
 						&snd_usb_mixer_vol_tlv);
@@ -1110,20 +1123,33 @@ static int snd_c400_create_effect_vol_ctls(struct usb_mixer_interface *mixer)
 	char name[64];
 	unsigned int cmask;
 	int chan, err;
+	int num_outs = 0;
+	int num_ins = 0;
 
 	const unsigned int id = 0x42;
 	const int val_type = USB_MIXER_S16;
 	const int control = 1;
 
-	for (chan = 0; chan < 10; chan++) {
-		if (chan < 6) {
+	switch (mixer->chip->usb_id) {
+	case USB_ID(0x0763, 0x2030):
+		num_outs = 6;
+		num_ins = 4;
+		break;
+	case USB_ID(0x0763, 0x2031):
+		num_outs = 8;
+		num_ins = 6;
+		break;
+	}
+
+	for (chan = 0; chan < num_outs + num_ins; chan++) {
+		if (chan < num_outs) {
 			snprintf(name, sizeof(name),
 				"Effect Send DOut%d",
 				chan + 1);
 		} else {
 			snprintf(name, sizeof(name),
 				"Effect Send AIn%d",
-				chan - 5);
+				chan - num_outs + 1);
 		}
 
 		cmask = (chan == 0) ? 0 : 1 << (chan - 1);
@@ -1142,20 +1168,33 @@ static int snd_c400_create_effect_ret_vol_ctls(struct usb_mixer_interface *mixer
 	char name[64];
 	unsigned int cmask;
 	int chan, err;
+	int num_outs = 0;
+	int offset = 0;
 
 	const unsigned int id = 0x40;
 	const int val_type = USB_MIXER_S16;
 	const int control = 1;
-	const int chan_id[6] = { 0, 7, 2, 9, 4, 0xb };
-	const unsigned int offset = 0x3c;
-				/* { 0x3c, 0x43, 0x3e, 0x45, 0x40, 0x47 } */
 
-	for (chan = 0; chan < 6; chan++) {
+	switch (mixer->chip->usb_id) {
+	case USB_ID(0x0763, 0x2030):
+		num_outs = 6;
+		offset = 0x3c;
+		/* { 0x3c, 0x43, 0x3e, 0x45, 0x40, 0x47 } */
+		break;
+	case USB_ID(0x0763, 0x2031):
+		num_outs = 8;
+		offset = 0x70;
+		/* { 0x70, 0x79, 0x72, 0x7b, 0x74, 0x7d, 0x76, 0x7f } */
+		break;
+	}
+
+	for (chan = 0; chan < num_outs; chan++) {
 		snprintf(name, sizeof(name),
 			"Effect Return %d",
 			chan + 1);
 
-		cmask = (chan_id[chan] == 0) ? 0 : 1 << (chan_id[chan] - 1);
+		cmask = (chan == 0) ? 0 :
+			1 << (chan + (chan % 2) * num_outs - 1);
 		err = snd_create_std_mono_ctl_offset(mixer, id, control,
 						cmask, val_type, offset, name,
 						&snd_usb_mixer_vol_tlv);
@@ -1299,6 +1338,7 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 		break;
 
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
+	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C400 */
 		err = snd_c400_create_mixer(mixer);
 		break;
 
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 81f70a719bb9..f94397b42aa5 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -367,6 +367,7 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 
 	switch (subs->stream->chip->usb_id) {
 	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
+	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 		if (is_playback) {
 			implicit_fb = 1;
 			ep = 0x81;
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 820580a6dfc3..c39f898b15d2 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -2325,6 +2325,77 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 		}
 	}
 },
+{
+	USB_DEVICE_VENDOR_SPEC(0x0763, 0x2031),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		/* .vendor_name = "M-Audio", */
+		/* .product_name = "Fast Track C600", */
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = &(const struct snd_usb_audio_quirk[]) {
+			{
+				.ifnum = 1,
+				.type = QUIRK_AUDIO_STANDARD_MIXER,
+			},
+			/* Playback */
+			{
+				.ifnum = 2,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 8,
+					.iface = 2,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.attributes = UAC_EP_CS_ATTR_SAMPLE_RATE,
+					.endpoint = 0x01,
+					.ep_attr = 0x09,
+					.rates = SNDRV_PCM_RATE_44100 |
+						 SNDRV_PCM_RATE_48000 |
+						 SNDRV_PCM_RATE_88200 |
+						 SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 4,
+					.rate_table = (unsigned int[]) {
+							44100, 48000, 88200, 96000
+					},
+					.clock = 0x80,
+				}
+			},
+			/* Capture */
+			{
+				.ifnum = 3,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 6,
+					.iface = 3,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.attributes = UAC_EP_CS_ATTR_SAMPLE_RATE,
+					.endpoint = 0x81,
+					.ep_attr = 0x05,
+					.rates = SNDRV_PCM_RATE_44100 |
+						 SNDRV_PCM_RATE_48000 |
+						 SNDRV_PCM_RATE_88200 |
+						 SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 4,
+					.rate_table = (unsigned int[]) {
+						44100, 48000, 88200, 96000
+					},
+					.clock = 0x80,
+				}
+			},
+			/* MIDI */
+			{
+				.ifnum = -1 /* Interface = 4 */
+			}
+		}
+	}
+},
 {
 	USB_DEVICE_VENDOR_SPEC(0x0763, 0x2080),
 	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 2c971858d6b7..7d7ad0b0620e 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -863,13 +863,14 @@ void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
 		ep->skip_packets = 4;
 
 	/*
-	 * M-Audio Fast Track C400 - when packets are not skipped, real world
-	 * latency varies by approx. +/- 50 frames (at 96KHz) each time the
-	 * stream is (re)started. When skipping packets 16 at endpoint start
-	 * up, the real world latency is stable within +/- 1 frame (also
+	 * M-Audio Fast Track C400/C600 - when packets are not skipped, real
+	 * world latency varies by approx. +/- 50 frames (at 96KHz) each time
+	 * the stream is (re)started. When skipping packets 16 at endpoint
+	 * start up, the real world latency is stable within +/- 1 frame (also
 	 * across power cycles).
 	 */
-	if (ep->chip->usb_id == USB_ID(0x0763, 0x2030) &&
+	if ((ep->chip->usb_id == USB_ID(0x0763, 0x2030) ||
+	     ep->chip->usb_id == USB_ID(0x0763, 0x2031)) &&
 	    ep->type == SND_USB_ENDPOINT_TYPE_DATA)
 		ep->skip_packets = 16;
 }