2012 Mac Mini - Using multi-output device?

I'm trying to get my Mini to output sound over HDMI and the headphone jack. This question has been asked before, but the answer wrongly claimed OSX didn't support it. The Audio MIDI Setup program (in the Utilities folder) does in fact let you set up a multi-output device that uses the headphone and hdmi out. But when I try to output sound with that device, I don't get anything.
Before I bought this computer, the Apple Store drone claimed this multi-output was possible. But this wouldn't be the first time I've talked to a complete idiot there.

Some more updates:
using multi-output and having the line out set as master prevents 5.1 surround from being output on HDMI, which is fine for my use. When I have something plugged into the headphone jack (in my case wireless outdoor speakers) the settings app won't even allow the settings app to choose HDMI as the audio output device, which is also likely why HDMI can't be master in the MIDI app.
So to get 5.1 surround back for movies I need to unplug whatever's in the headphone jack and change the output device from the multi-output option to HDMI. It's sad my 6 year old PS3 handles this more elegantly and sensibly but at least I don't have to take back my Mini now

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