diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c
--- a/sys/dev/sound/usb/uaudio.c
+++ b/sys/dev/sound/usb/uaudio.c
@@ -2153,6 +2153,7 @@
 	uint8_t bits = uaudio_default_bits;
 	uint8_t y;
 	uint8_t channels = uaudio_default_channels;
+	uint8_t channels_max;
 	uint8_t x;
 
 	bits -= (bits % 8);
@@ -2160,22 +2161,23 @@
 		/* set a valid value */
 		bits = 32;
 	}
+	switch (usbd_get_speed(udev)) {
+	case USB_SPEED_LOW:
+	case USB_SPEED_FULL:
+		/*
+		 * Due to high bandwidth usage and problems
+		 * with HIGH-speed split transactions we
+		 * disable surround setups on FULL-speed USB
+		 * by default
+		 */
+		channels_max = 4;
+		break;
+	default:
+		channels_max = UAUDIO_CHANNELS_MAX;
+		break;
+	}
 	if (channels == 0) {
-		switch (usbd_get_speed(udev)) {
-		case USB_SPEED_LOW:
-		case USB_SPEED_FULL:
-			/*
-			 * Due to high bandwidth usage and problems
-			 * with HIGH-speed split transactions we
-			 * disable surround setups on FULL-speed USB
-			 * by default
-			 */
-			channels = 4;
-			break;
-		default:
-			channels = UAUDIO_CHANNELS_MAX;
-			break;
-		}
+		channels = channels_max;
 	} else if (channels > UAUDIO_CHANNELS_MAX)
 		channels = UAUDIO_CHANNELS_MAX;
 
@@ -2193,7 +2195,21 @@
 			/* try find a matching rate, if any */
 			for (z = 0; uaudio_rate_list[z]; z++)
 				uaudio_chan_fill_info_sub(sc, udev, uaudio_rate_list[z], x, y);
+
+			/* after default value in first round, proceed with 32 bits */
+			if (y == bits)
+				y = 32 + 8;
+			/* skip default value subsequently */
+			if (y == (bits + 8))
+				y -= 8;
 		}
+
+		/* after default value in first round, proceed with max channels */
+		if ((x == channels) && (channels < channels_max))
+			x = channels_max + 1;
+		/* skip default value subsequently */
+		if (x == (channels + 1))
+			x--;
 	}
 	if (sc->sc_sndstat_valid)
 		sbuf_finish(&sc->sc_sndstat);