right finger attacks (picking, fingerstyle, etc)
honestly speaking - the right hand is everything. it really is. every small angle of attack. the thumb vs. nail, and the blending of the two. nail length. i would even go on to say fingerprint..matters.
left hand pressure
choice of guitar -- guitar materials
choice of string
age of string
choice of pickup
guitar pickup settings
different pick materials (agate stone pick)
for the most part:
No amps or cabs.
No guitar plugins or pedals.
nothing else is needed.
but if i need some edge or crunch
every time i pass a signal through a process, i erode resolution and source material.
i seek to be as natural as possible.
treat the string as a string.
not as something that needs an amp or cab.