I woud like to set up the default sound volume once for all, for all ALSA devices that will be connected ever.
Of course, I could do
amixer ... or even
alsamixer to modify the volume of currently available soundcards.
But I really want to modify the default volume even for future soundcards that will be added later.
In which config file should I set this default sound volume?
/var/lib/alsa/asound.state but the content is specific to currently connected soundcards.
What I want is a solution that will apply to any soundcard that will be connected.
Context : why do I want this? I'm providing a ready-to-use Debian image for my project SamplerBox. User #1 might use the computer's built-in-soundcard, User #2 might have a USB DAC, User #3 might have another soundcard...
I would like to provide a default -3dB volume that will work for any ALSA soundcard people could have...
Note: I reinstalled a fresh new system and it seems that, by default, the volume is -20dB for all devices :