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How to add audio to TonidoPlug2
. Download sound_tonidoplug2.tar.gz
tar xvfz sound_tonidoplug2.tar.gz -C /lib/modules/
depmod -a
modprobe snd-hwdep
modprobe snd-rawmidi
modprobe snd-usb-lib
modprobe snd-usb-audio

lsmod (this show drivers installed)

install sound mixer, tools, and etc
apt-get install libasound2-dev alsa-tools alsa-utils alsa-oss
. setup alsa as output
. edit /etc/modprobe.d/alsa-base.conf
  last line is: options snd-usb-audio index=-2
  should be: options snd-usb-audio index=0
. download mpg123 or madplay and the audio should work.
. if the output has pops in it.  both my usb audio device did.  (usb sound blaster and syba usb audio) download asound.conf and place it in /etc.