http://netbsd.i2p/docs/guide/en/chap-audio.html
All available audio devices can be listed with audiocfg list : $ audiocfg list 0: [*] audio0 @ hdafg0: Realtek ALC292
playback: 2ch, 48000Hz
record: 2ch, 48000Hz
(PR) slinear_le 16/16, 2ch, { 32000, 44100, 48000, 88200, 96000, 192000 }
(PR) slinear_le 20/32, 2ch, { 32000, 44100, 48000, 88200, 96000, 192000 }
(PR) slinear_le 24/32, 2ch, { 32000, 44100, 48000, 88200, 96000, 192000 }
...