aplay

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia_1 [HDA NVidia], device 0: ALC889 Analog [ALC889 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0



$ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
pulse
    PulseAudio Sound Server
default
    Default ALSA Output (currently PulseAudio Sound Server)
sysdefault:CARD=NVidia_1
    HDA NVidia, ALC889 Analog
    Default Audio Device
front:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    Front speakers
surround21:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=NVidia_1,DEV=0
    HDA NVidia, ALC889 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=NVidia,DEV=0
    HDA NVidia, HDMI 0
    HDMI Audio Output
hdmi:CARD=NVidia,DEV=1
    HDA NVidia, HDMI 1