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.wav

Recording 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