cat proc/asound/cards

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 0 [SB             ]: HDA-Intel - HDA ATI SB
                      HDA ATI SB at 0xf0000000 irq 16
 1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xcfdec000 irq 19
 2 [Headset        ]: USB-Audio - Turtle Beach P11 Headset
                      Generic Turtle Beach P11 Headset at usb-0000:00:12.0-1, full speed

aplay -L

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null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=SB
    HDA ATI SB, CONEXANT Analog
    Default Audio Device
sysdefault:CARD=SB
    HDA ATI SB, CONEXANT Analog
    Default Audio Device
front:CARD=SB,DEV=0
    HDA ATI SB, CONEXANT Analog
    Front speakers
surround40:CARD=SB,DEV=0
    HDA ATI SB, CONEXANT Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=SB,DEV=0
    HDA ATI SB, CONEXANT Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=SB,DEV=0
    HDA ATI SB, CONEXANT Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=SB,DEV=0
    HDA ATI SB, CONEXANT Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=SB,DEV=0
    HDA ATI SB, CONEXANT Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=SB,DEV=0
    HDA ATI SB, Conexant Digital
    IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=HDMI,DEV=0
    HDA ATI HDMI, HDMI 0
    HDMI Audio Output
default:CARD=Headset
    Turtle Beach P11 Headset, USB Audio
    Default Audio Device
sysdefault:CARD=Headset
    Turtle Beach P11 Headset, USB Audio
    Default Audio Device
front:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    Front speakers
surround40:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Headset,DEV=0
    Turtle Beach P11 Headset, USB Audio
    IEC958 (S/PDIF) Digital Audio Output