I've only been at this since May but my experience is the opposite from Pipsnchicks's. I'm raising jumbo browns and I've never once heard the roosters in either of my two breeding cages crow.
I separate the birds by sex as early as it's possible to feather-sex them, three weeks. The brooding box full of males starts crowing at about four weeks and by five weeks one of them is crowing every couple of minutes.
I've got one rooster I've spared from slaughter that lives by his lonesome and serves as my "back-up" rooster, in case one of the two in the breeding pens dies or starts shooting blanks. He crows as soon as he an catch his breath from the last crow (I think the solitude has made him psycho).
But it's not very loud and not a 'piercing' crow, like a chicken rooster's, and not an unpleasant sound. I was in my neighbor's back yard talking with them about the birds when the psycho rooster cut loose. I interrupted the conversation and told them that was one of my roosters crowing. The Missus said that if I hadn't told her otherwise, she'd have thought that was a songbird singing. To me it sounds like the squawk of a parrot with laryngitis. I'm waiting for one of them to tell me, "Polly wants a crumble!"
The biggest noise that mine make is the sound of their feet striking the hardware cloth floors. I've got four separate cages in the quail coop, and the noise of them rampaging around in their cages is constant (except when it's nappie-poo time).
I've never tried to raise any sort of animal before (except sea monkeys) and my hatch rates on my last two batches of quail eggs through the incubator were 82% and 75%. My biggest problem now is I never planned for being able to hatch so many eggs. What on earth do I do with all these birds? And if I can do it, that proves it doesn't take smarts or skill.