I dunno, and obviously this is a point of nuance anyway.
It's just that Rorschach has a lot of resent and scorn for the world around him; it makes sense to me for some of that to come through in his voice, and that's how I more or less "heard" him.
Low affect sure, facial expression neutral, even under a mask, but what I took from my reading is that he thinks that other people just don't get it and never will. That he, and maybe Blake, understood how things really were, and he's the only one who can save these ridiculous, filthy people from themselves. Even when biting off more than he can reasonably chew, like breaking into the military base to talk to Manhattan. He knows the score. Clearly someone's trying to kill them all, and he has to convince these other fools.
The voice is as low and gravelly as I expected, it's just that I guess there's a little undercurrent there that sounds right to me, but not necessarily to you. And it is little, I mean, it's not like he exaggerates "Oh, save us" with a different voice or something... it's all gravelly, all low.
