Headphone jack?

Depends on the DSLR, not all of them send full time audio over HDMI.

Its got potential though thats for sure.
 
I own a Marshall V-LCD70MD monitor that has a built-in headphone jack on the front face...

Panasonic GH2 HDMI : No audio at all

Nikon D5200 HDMI : Clean, clear, and loud audio

So good news for Nikon D5200 owners, this Amazon device or an external monitor will let you monitor your audio.
 
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