TS4113 Is there a terminal or other type of workaround to allow sound to come from the HDMI and headphone jack at the same time?

I have a late 2012 Mini, running 10.8.2.  I have a set of powered speakers plugged into the headphone jack.  My TV is running on a direct HDMI connection.  I can only stream sound through HDMI, or even select it as an output, if I unplug my headphone speaker plug.  Apple's knowlege base says this is the case.  I am looking for a way to have both plugged in all the time, and have the sound mirrored to both.
     I use the speakers for itunes music, system sounds, skype, etc..  The HDMI sound is for steaming content to the TV.  I don't want to have to reach around behind the computer and unplug/plug each time I switch, for a multitude of reasons.  Any ideas out there?  Google wasn't getting me very far.  Maybe a terminal solution of some sort?  Thanks in advance.

it seems that m1r3k found a very good workaround, at least for the Mid 2010 Mac mini models (that I'm using right now). I don't know if it works also with more recent Mac mini models.
Re: After upgrading to lion, cant select HDMI sound setting
Open Audio MIDI Setup.app in /Applications/Utility, click the + (plus) button in the bottom left corner of the window and choose "Create Multi-Output Device". In the new device settings tick the HDMI "Use" checkbox and you're done. Simply go to the usual System Preferences Audio panel and choose the newly created device, without the need to unplug the audio cable from the back of the Mac mini. You can also name the new audio device as you want.
NOTE:
This is only a workaround for a deliberate choice made by Apple on OS X Lion 10.7.2 and beyond:
Mac mini: About HDMI audio and headphones
Please let Apple know (here or here) how this has made things unnecessary awkward for users and needs to be fixed (these forums don't count, they are not read by Apple's employees)!

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