I had to remove the following default line from /boot/config.txt: dtparam=audio=on /boot/config.txt, and rebooted: I confirmed the DAC was working correctly by running sudo aplay -l. mplayer (e.g. mplayer file.mp3). I should note that by default, using my pair of Audio Technica over-the-ear headphones, I was glad to not have them on my ears when I did this the first time—the default volume was something like 88%, and that would've probably ruptured my eardrums! I turned the volume down to a more pleasant 4% using the / key and was able to enjoy a few songs through the MirkoPC. The audio circuit on it sounds great, and I could not hear any discernible background noise—which is better than I can say for many devices!