I suspect that the volume of pulseaudio is off so I want to use amixer to turn it up from the command line. Can I do this? The amixer syntax is a bit confusing.
I use this:
amixer -q -D pulse set Master toggle
amixer -q -D pulse set Master 5%+ unmute
amixer -q -D pulse set Master 5%- unmute
-D pulse: to make sure we are using pulseaudio (optional)
unmute: so we do not accidentally raise the volume in muted state and be surprised when unmuting