Comment 9 for bug 346878

cat /proc/asound/cards /proc/asound/pcm
 0 [SB ]: HDA-Intel - HDA ATI SB
                      HDA ATI SB at 0xf0700000 irq 16
 1 [Headset ]: USB-Audio - Logitech USB Headset
                      Logitech Logitech USB Headset at usb-0000:00:13.0-1, full speed
 2 [Headset_1 ]: USB-Audio - Logitech USB Headset
                      Logitech Logitech USB Headset at usb-0000:00:13.0-2, full speed
00-04: ALC268 Analog : ALC268 Analog : capture 1
00-00: ALC268 Analog : ALC268 Analog : playback 1 : capture 1
01-00: USB Audio : USB Audio : playback 1 : capture 1
02-00: USB Audio : USB Audio : playback 1 : capture 1

hope this helps out.
and it's great to see such interest in something that is probably just a minor issue for most