# Pastebin lWr1uh3z
# mixer -a
pcm0:mixer: <USB audio> at ? kld snd_uaudio (play/rec) (default)
    vol       = 0.75:0.75     pbk
    pcm       = 0.75:0.75     pbk
    mic       = 0.25:0.25     pbk
pcm1:mixer: <USB audio> at ? kld snd_uaudio (play)
    vol       = 0.75:0.75     pbk
    pcm       = 0.75:0.75     pbk