## audio loopback

amixer sset 'Headphone' 67
amixer sset 'Speaker Function' 'on'
amixer sset 'Line In Function' 'off'
amixer sset 'Playback' 192
amixer sset 'Capture' 15
amixer sset 'Capture Vol Reduction' 'No Change'
amixer sset 'ADC Mux' 'MIC_IN'
amixer sset 'DAC Mux' 'DAC'
amixer sset 'Jack Function' 'on'
amixer sset 'MIC GAIN' '20dB'
amixer sset 'Speaker Function' 'on'
arecord -c 1 -f U8 -r 8000 -d 5 | aplay