Thats something along the lines of what I was thinking, but with only the audio out port accessible it wouldn't work. frankly, I'm stumped on it. The only thing I could remotely think to do with only that port would be...I dunno. Try and use it to short out CMOS with an electric shock? High probability of permanent damage to the board, definitely fry the card in the process, but if you were dead set on trying to break in and that was the only way...how crazy is that? Even if you pushed it all the way to the point of frying it, results would be doubtful.
@ KGONEPOSTL
Frankly, some good old fashioned social engineering would provide better results for the purposes of access. This is speculation only. I don't think Wetwork has anything to fear from this conjecture.