ESP BASS PROBLEMS, B-50?

It probably was just never set up right to begin with - did you buy it new? If so take it back to the shop obviously and they shouldn't charge you for it.

But you may have a reverse bow in the neck, making the strings too LOW, via the truss rod being set too tight.

OR you may have the nut (the mini bridge at the end of the neck) set too low.

Look down the fretboard lengthwise from the body - does it curve up? down? It should basically appear perfectly straight.

If it buzzes on open AND fretted notes, then you have a reverse bow because your truss rod is too tight! You can fix that by taking off the trussrod cover (these days it may just have a hole) and LOOSEN the truss rod using a hex wrench.

Do it in small increments (about 1/4th counter-clockwise at a time, then tune and play it each time to see if the problem was fixed).

It normally shouldn't take more than a 1/2 turn to fix it, unless some joker really cranked the hell out of it, which I doubt.

After you loosen the truss rod, you may have to lower the bridge (what you called the tremelo) again somewhat.

If it only buzzes on an open note, but not when the string is fretted, then your nut may well be too low - you remove it and build it up from the underside using a SMALL amount of wood putty or epoxy.

At the right height, there should be just about the same clearance between the string and the FIRST fret, as there is between the string and the SECOND fret when you fret the first fret. I.e., not much, but just enough so it doesn't buzz.