1st- horizontal vibrato you rock your hand gently at the fret keepin finger in the same place, release your thumb from the neck to add more effect
2nd- vertical vibrato you move your finger back and forth along the fret, not goin up or down just side to side.
3rd- wide vibrato just move the string up and down quick.
4th- again like first one keep your finger still but quickly rotate the wrist from side to side. classic blues vibrato.
an of course you could always take your pickin hand and bend the note usin the string beind the nut.
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