Like Julian says, finding the source of the buzzing would be your first task. If it is actually the strings making the buzzing, it probably comes from one of three places: the nut, the bridge, or possibly a fret that is touching a string. If you have the string height too low at the nut, it is possible that one of the strings is touching a fret somewhere along the fingerboard.
Hey Jeff, it really depends on where the buzzing is coming from. If it's from the nut, it could be the that the break angle over the nut isn't sharp enough in which case a string tree or two would help. It could be that the string slots in the nut are a little wide and the strings are rattling around in them. You may be able to build-up the slots with superglue to hold the strings tighter - a bodge, but it has worked for me before with a cheap guitar! If the problem is at the bridge end, much the same problems can occur as at the nut. If the bridge is not fixed, try turning it at a slight angle and see if that makes a difference. Are you sure it's not part of the box that's vibrating? Does the buzzing go away if you hold the box closed tightly? Does the bridge sit nice and flat against the soundboard? Sorry so many questions, but it really is a case of eliminating possible causes and tracking down the source before you can overcome the problem. Good luck!
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