Saving ALSA settings?

[Baslow]

I'm running the Manjaro which shipped with my ANSI Pinebook Pro. Sound works fine BUT every time I reboot I must open a terminal, run alsamixer (which, I confess, I don't understand very well), hit F6, choose rockchip, es8316-codec, and increase the first "Headphone" meter (there are two! Why?) from 0 to (usually) 100 -- since it seems to increment only from 0->28->56->100. This setting usually serves me fine until shutdown. So I have two questions

1. Is there any way to save this "Headphone" setting so I don't have to reset it each time? Alternatively, is there any config file I could edit with Vim to edit this setting (provided I can identify the proper setting name)?
   
2. Is anyone aware of ALSA documentation readable by mere mortals where I can read up about how it works so I can figure out questions like this myself, in the future?
   

Thanks. My apologies if this issue is covered elsewhere in the forum. I searched but didn't find anything obviously relevant.