vivien/i3blocks — pull request #48 by Nycroth (2014-09-30 16:22:12+00:00)
Title: Volume script made more universal

Not all devices use Master as their main volume control. Most notably, USB audio devices. I have one that uses Headset and another using Speaker. Removing the 'get Master' parameter doesn't change this as the main volume control is always the first control (as far as I've seen).