What are my audio devices?
Run the command (in the terminal)
aplay -l
The output looks like
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
The device for this is plughw:0,0. The two zeros come from the device 0 and Subdevice #0.