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card indicates card number, device indicates device number.<br>
aplay -l it could check the system to load the sound card number and details<br>
cat /proc/asound/cards it also could check the sound card and details <br>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.It needs Switch to modify configuration on file system for output on 3.5mm ofgraphical interface<br>/etc/asound.confOpen smplayer, modify card1 into card0select preferences on options, or use amixer to modifyselect alsa(audiocodec). The default It could only open one is configured, of HDMI or you could use player on graphical interface to switch via sound channel selectionaudiocodec in one time.<br>
c.How to use mic sound recording <br>
arecord -d 5 -f cd -t wav 123.wav<br>
aplay 123.wav<br>
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=== '''Universal Software Configuration''' ===
