I can't listen to your audio right now, unfortunately...
As <b>pigglet</b> mentioned... headstock: check that all the hexnuts around the tuning pegs are reasonably tight...
Umm, so, clean picking technique is a good thing.
Clean fingering: bar chords can sometimes cause buzzing if your barring finger is not solid across all relevant strings. Or, perhaps, a specific fret is to blame. Try playing single notes on every string & fret (one at a time!); see if certain spots give you a little rattle. Sometimes a fret can be worn down such that when fingering on that fret, the string sits a little lower than it ought to be, causing it to vibrate against the next fret up (a less worn fret). Aside from a costly refretting, you can (I <i>think</i> you can!) raise the string a bit from the bridge saddle.
Alternately, one (or more) strings may sit a bit too low in the nut, causing slight vibration against the first fret. Again, that string may be raised slightly at the bridge... or you can get someone to replace or adjust the nut. I think I read that you can put a little epoxy glue in the offending nut slot (without the string in it, obviously!), let it dry, perhaps file it smooth, and voila, it's a little higher than before. Ask someone knowledgable before putting epoxy all over your guitar please!
I'm really hung over at the moment; I apologize for any lack of clarity in my response!
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