Audio Interface Testing
EC-A1688JD4 supports the American standard headphone interface.
Playback Test:
$ aplay -D hw:CARD=cv186xdac,DEV=1 /usr/share/sounds/alsa/Front_Center.wavRecording Test:
$ arecord -D hw:CARD=cv186xadc,DEV=0 -c 2 -r 48000 -f S16_LE test.wav # Record audio (stereo)
$ aplay -D hw:CARD=cv186xdac,DEV=1 test.wav # Play the recorded audio