Sound Through Headphones and Speakers at the Same Time

Windows lets me have sound through my speakers and headphones simultaneously, which is great for not having to plug in/unplug my headphones when I want to switch.  I just have to don the headphones and turn down the volume on my speakers.  No fiddling about with jacks.

However!  Ubuntu seemed to have no way of sorting this out.

This post, however, describes how to change your line-in into an output jack!
http://askubuntu.com/questions/225017/how-do-i-change-which-audio-jacks-are-used-for-input-and-output

It uses the HDA Analyser tool from the Alsa Project.  Not a well documented tool, but the post above has all the information you need.

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