| what he is doing is playing with his thumb and 2 fingers ( index and middle ). he uses each digit to cover one string - thumb for e and a, index for d and middle for g and then covers three strings simultaneously with his left fingers and then gets a rolling pattern going with his right hand and moves his left hand around alternately fretting notes or letting his fingers rest on top of the strings. i do the same thing but i do it with chords and have gotten very fast at it. to try this i suggest muting all of the strings with your left hand and work on getting an even thumb slap index pluck middle pluck going and then before worrying about left hand fretted notes. the bent harmonic is this guy bending the neck (a la jaco ). these can also be done by pressing the string down on the headstock between the nut and the tuning pegs and moving the string that way ( i believe it was status basses that came up with something called the bendwell that was an extended portion of the neck with a deeper cutaway to facilitate this.
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