Newbie question here for the board...

How much chain buzzzzz is normal when pedaling? My Trek 4500 seems like it's louder than it should be when I'm pedaling on flat roads. I always thought the chain should be pretty quiet as you pedal... is this a matter of getting it tuned and adjusted, or is it something that is normal? The shifting is very smooth and the pedaling is fluid... so I know there's no mechanical problem that is impairing functioning. It seems to buzz the loudest in the largest front chainring and when I stop pedaling and just coast, the buzz is still there.
The bike is relatively new with less than 100 total miles, almost all on the street...

Any thoughts or opinions are greatly appreciated. Thanks.