Using Amixer to control volume

If you want to use amixer to control the volume, this should work in a terminal:

amixer -D pulse sset Master 0%

(0% to mute or use any percentage you like)

To reduce/increase the volume, you can add - or + after % (but that doesn't work to increase the sound beyond 100%).

might be possible you use the wrong card. make sure you use the right card. If you have attached a webcam with mic for example, then it might eat the first slot ;-)

list all cards first:

cat /proc/asound/card

for me itlooks like:

 0 [Webcam         ]: USB-Audio - Philips SPC 1030NC Webcam
                      Philips CE Philips SPC 1030NC Webcam at usb-orion-ehci.0-1.2, high speed
 1 [Audio          ]: USB-Audio - USB Audio
                      USB Audio at usb-orion-ehci.0-1.5.7, full speed

then chose your card. 1st card would be default -c 0, so if you want to chose the 2. card then do:

amixer -c 1 Master +10 

I have found 3 useful commands:

amixer -D pulse sset Master 5%-

amixer -D pulse sset Master 5%+

amixer -D pulse sset Master toogle

Other 2 commands:

amixer -D pulse sset Master mute

amixer -D pulse sset Master unmute