How jacked up. Not likely a mistake.
Mic Dropped: Debate commission admits ‘issues’ with Trump’s audio
http://www.foxnews.com/politics/2016/10/01/mic-dropped-debate-commission-admits-issues-with-trump-s-audio.html
Presidential Debate Commission Admits Trump’s Mic Was Messed Up
http://dailycaller.com/2016/09/30/presidential-debates-admits-trumps-mic-was-messed-up/
There were FReepers on the live debate thread saying his mike had been messed with .