The vlm script provides elementary sound control actions to set
pulseaudio volume, mute or unmute sound and cycle through pulseaudio
outputs, such that actions performed through this script will probably
achieve sane results on all systems using pulseaudio. The script does
not need any configuration from the user to perform its actions.

It is provided so that the user can bind the script's actions to
keyboard shortcuts of his choosing, and have those shortcuts trigger
easy and consistent sound control actions.

Because the script's capabilities are not exhaustive, and because it
does not provide any output about their effects, it can not replace a
full-blown sound mixer program.

The script uses the pactl program to determine the currently active
pulseaudio sink, then uses the same command again to perform its action.

For usage information, type the command vlm without any argument.