Oh but I think your current vibrato works for acoustic/classic...not sure though.
I've just learned vibrato last year and wasn't able to refine it yet (I don't have much time XD). Well just as long as you're doing vibrato with your wrist, you're doing the right thing. Bending vibrato is much much trickier XD but it's still using the same technique.
Anyway, I hope I can have time doing covers ><
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