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It could be used after use alsamixer to change the sound card.<br>
alsactl store -f /var/lib/alsa/asound.state used for saving modified parameters<br>
b.Switch It needs to graphical interface<br>Open smplayermodify configuration on file system for output on 3.5mm of /etc/asound.conf,select preferences on optionsmodify card1 into card0, select alsa(audiocodec)or use amixer to modify. It could only open The default one of HDMI is configured, or audiocodec in one timeyou could use player on graphical interface to switch via sound channel selection.<br>
c.How to use mic sound recording <br>
arecord -d 5 -f cd -t wav 123.wav<br>
