Fix volume control in mpd on Ubuntu Jaunty 9.04

I have mpd installed on my jaunty server. It works well, except that I found the volume control in my clients never worked.

Reading around, I found a slightly cryptically mentioned solution. In your /etc/mpd.conf, uncomment the line that says mixer=software, then restart mpd (sudo /etc/init.d/mpd restart). All should be well!