I know roosters are really fun animals, but if you are not breeding, it would be better to get rid of him before the government shuts you down.
Their sound ordinance exempts agricultural noises. Roosters can be considered agricultural, therefore any crowing is exempt. If the neighbors are complaining, that is the neighbor's problem, not the OP's. For all anyone knows, the OP researched where they could legally have an entire flock of chickens (including roosters) and purchased in that neighborhood for that reason.