Running the command:
amixer -D pulse sset Master 30%
should set the audio volume to 30% right?
amixer get Master
It returns saying the audio volume is 52%.
Any explanation or solution to my problem? Thanks!
Pulseaudio has its own set of volume controls, and the
pulse device is the converter that lets ALSA-only applications use Pulseaudio.
I very much doubt setting any mixer control on the
pulse device does anything sensible. And I'm not sure which value reading mixer controls would return, possible the volume setting of the default sink (but I'd have to read the source code to find out).
If you want to control the volume of Pulseaudio applications from the commandline (no matter if they use Pulseaudio via ALSA, or directly), have a look at