Vibrato vs. tremolo 
       ====================
       
       
       Introduction 
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       Many guitarists people mistake tremolo for vibrato and vice versa. Even worse, the famous tremolo bar on guitars actually creates a vibrato effect. 
       
       
       In this article the difference is visualised and audiolised. 
       
       
       Vibrato 
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       Varying frequency (pitch or tone height) over time. 
       
       
       A 440 Hz tone with 6 Hz vibrato effect : 
       
       
       Tremolo 
       --------
       
       
       Varying amplitude (volume) over time. 
       
       
       A 440 Hz tone with 6 Hz tremolo effect : 
       
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