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Tremolo bar flutter

A rapid, shallow oscillation of the tremolo arm that adds a shimmering vibrato to a held note or chord.

Flutter is made by letting the arm move freely under the palm in tiny, fast movements rather than pressing it deliberately. On a floating tremolo the arm sits under the hand naturally and the vibration of a loud chord can even set it going by itself. The effect is most common in surf, ambient and instrumental rock playing, where a sustained chord needs movement without pitch change, and it is one of the few techniques where the tremolo is used as a subtle texture rather than a stunt.

Example: A long, ringing surf chord that shimmers without any obvious button-pressing motion is being fluttered with the tremolo arm.

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