I was wondering if their was a name for this, or whether it is just another type of vibrato. it involves varying the pressure on the string, i.e. pushing down hard, softening and then hardening your grip etc. i was wondering what this was called as i have never seen reference to it.
Sounds like just another vibrato to me.
Since you're actually pressing down on the fret board, you could be sounding a note again.
or if you're pressing hard enough you're bending the note slightly sharp each time
or you're just wasting string life
I would call it an inefficient way of getting a vibrato.