Now this is the fun part. With Dexter's voice whenever he's killing or doing an innermonologue I describe it as "gravelly" and have a lot more grit than what he has whenever hes speaking to someone normally on a day-to-day basis. 

In a way it's hypnotizing, like once you hearhim you can't help but just be scared. The gravel in the voice can be compared to like actual gravel in where you can't really predict if you slip (or am i thinking about sand? i dont know just picture yourself climbing a sand-hill and you'll know what I mean.)

He's like on the edge, he can't hold in that killing urge anymore so its kinda like he's finally replenishing, like he's been waiting for this moment.

Audition Lines are taken from Dexter S01 EP1, Killing Mike Donovan scene and Dexter talking about his step-sister Debra Morgan.