BIGTREETECH CB2 - Setting up 3.5 Mm Headphones Port

BIGTREETECH CB2 User Manual
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5.8. Setting up 3.5mm Headphones Port
1. Enter the command: aplay -l
Check for the corresponding sound card, as shown in the image (the sound card for
the headphone port shown in the image corresponds to card 0).
2. Enter the command:
amixer -c 0 contents (0 represents the card 0 found in the previous aplay -l command)
Check the settings for playback and recording channels, as shown in the image.
3. Enter the command:
amixer -c 0 cset numid=1 3
Set the playback channel, as shown in the image.