hey there, i never tried to play any metal yet but heard that many do tremelo picking. care to share what is happening cause it seem u use wrist to strike fast but where it says tremelo, its like u gota move the tremelo arm aswel lol iv confused myself.
Tremolo picking is just really fast picking, it has nothing to do with the tremolo bar... as for technique, its mainly using the wrist, search youtube for technique videos
As said above, ignore the bar. It's tremolo PICKING xD play from the wrist. Practise with a metronome to get to timing consistent, but it's essentially alternate picking done at high speed.
^ This. So much this.