Nothing like reinventing the wheel. Especially, if every other wheel has six-sides. Well, this one has seven.
Supported sound backends are ALSA and Pulseaudio; volctl automatically chooses the one that seems to be active at the moment.
Basic usage:
See the current volume: volctl
Mute or unmute the sound card: volctl mute and volctl unmute, or volctl toggle respectively.
Adjust the sound levels: volctl VALUE, or volctl +VALUE or volctl -VALUE.