By Paul McGill I think every guitarist at one time or another has a problem with the unwanted phenomenon of instrument vibration. Let's describe it as noise made when a vibrating part of the guitar comes into contact with another part of the guitar, which may or may not be also vibrating. The resulting sound can have its own frequency or can become a cacophony of noises not in the control of the player.
Most loose parts make noises that are frequency related.
Most fret noises or string buzzes are related to the geometry of the instrument's action setup. The most common buzzes are caused by action problems. There are limits to what can be expected of the action height. However, a well set up instrument can be played with reasonable comfort depending on the demands of the player. Let's go through a rundown of a number of indicators for action problems and their solutions, and then I will move on to the noises made by different body parts.