Performance and Effect
A pull-off is performed on a string which is already vibrating; when the fretting finger is pulled off (exposing the string either as open or as stopped by another fretting finger lower on the same string) the note playing on the string changes to the new, longer vibrating length of the string. Pull-offs are performed on both fretted instruments (e.g., electric guitar) and unfretted instruments (e.g., violin). They are used to sound grace notes, in part because since the string is not picked or bowed again to produce the sound of the second note, the transition from one to the other sounds gentler and less percussive.
In the transition between the initial and final notes, the string may vibrate in an inharmonic manner for several cycles if it is plucked with the fretting finger, because the string is being plucked in a part of the string not usually used for plucking. The result,a slight "quack" sound, may be particularly audible when the interval of the pull-off is large. This transition also consumes some of the vibrational energy in the sounded string, with the effect that the second note is generally much quieter than the original.
Read more about this topic: Pull-off
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