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====== Alsa ======

Alsa is used for audio playback.

NX does some initialization of audio:
  * ''amixer sset PCM 144''
  * other magic to get it actually working?

People have had mixed results with Alsa initialization. One person only had success by running NX:
> Saving and restoring alsa device state isn't enough to initialize with from boot. The NX binary is built with [[https://github.com/mackron/miniaudio|miniaudio]] inside of it so perhaps it does some external hardware initialization of the speaker? Couldn't get miniaudio in a custom binary to work without initializing by running NX. Maybe there's a way to coax out the miniaudio debug logs from a running NX instance.

Another person found that it worked out-of-the-box:
> Copying an audio file (in my case, a 44.1kHz mono WAV file) onto the SD card and then playing it with ''%%aplay%%'' worked even with NX disabled. ''%%alsamixer%%'' is preinstalled and works for setting the volume.