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command is the IP address of the Orange Pi development board and needs to be
replaced
test@test:~/AudioTest$ scp audio.wav root@192.168.1.47:/root
3) Then use alsamixer to open the audio adjustment interface (press Esc to exit
alsamixer)
root@orangepi:~# alsamixer
a. The linux5.4 system needs to use the arrow keys to adjust the Line Out and DAC
to the maximum
b. The linux3.4 system first needs to use the arrow keys to move the cursor to the
Audio lineout, and then press the "M" key to open the Audio lineout. After
opening, the box on the Audio lineout will display 00
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