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1. ALSA: multiple USB sound cards 2015-01-12

   tags: audio, card, device, linux, linux/alsa, sound

   [ permalink ]

   # /etc/modprobe.d/snd_usb_audio.conf
   options snd_usb_audio vid=<vid1>,<vid2> pid=<pid1>,<pid2> index=<index1>,<index2> enable=1,1
   

   example:

   # 5: M-Audio Fast Track Pro 
   # 6: Focusrite Scarlett 6i6
   options snd_usb_audio vid=0x763,0x1235 pid=0x2012,0x8012 index=5,6 enable=1,1
   

   See also: http://alsa.opensrc.org/MultipleCards