set_volume

set_volume sets the master mixer volume and controls the mute from the command line via command line parameters. This makes it possible to script volume effects like fade in and fade out or just set the volume from any old batch script. When combine this program with sleep, you can create complex volume effects.
Parameters
set_volume [options] [volume]
-v [volume as ] : sets volume Ex: set_volume -v 50 will set volume to 50
-m : mutes computer Ex: set_volume -m will mute the volume
-u : unmute computer Ex: set_volume -vu 60 will set the volume to 60% and unmute the volume
It uses the same engine that the Alarm Clock of Justice uses to set the volume.