1) Primarily a pronounced midranged (can vary low to upper) grrrrrrrrr
-like tone. Often enhanced by 600Hz boost,
Aggressive technique, playing near the bridge, and accenting the bridge pup.
2) Gallien
-Krueger defines growl as-a small amount of even order harmonic
Distortion (UrbanAssault415)
3) strings can produce a "string growl" exhibited during slides resulting from the strings lightly grazing the frets - becoming
String rattle when the
Action is too low.