I Hardware corresponding output interface:
As shown in the figure:
A is the HDMI output interface
B is the horn output interface
C is the headphone output interface
II Sound output switching method:
Click on the horn icon in the lower right corner of the system first
Click on the small triangle to the right of "2" in the picture to pop up an optional sound output interface
A is the sound output from HDMI to the display device
B is the sound output from the onboard speaker interface
C is the sound output from the headphones