BIGTREETECH Pi2 - Setting up 3.5 Mm Headphones Port

BIGTREETECH Pi 2 User Manual
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view the process number, then use kill -9 process_number to delete the
corresponding playback process.
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.