Tremolo Muscle for Articulation

Tremolo is created at the vocal folds, opening and closing in a rhythmic fashion. This controlled muscle is also often used for articulation. In fact, it's the primary articulation (think slight cough) used for blow notes in post war Chicago blues (except for chugging, where the "T" and "K" articulations are more common). Though not common for draw notes, you can use it as well, especial for fast passages when tongue blocking (a lick in Little Walter's "Evan's Shuffle" comes to mind where I consciously used it, the 5 draw at 1:04).