A method for configuring blades of a wind turbine for low noise generation. The method includes providing at least one noise measuring device. The noise measuring device is arranged and disposed in a position to measure noise of the blades during rotation. The wind turbine is configured to include a rotational trigger, the rotational trigger being arranged to provide a signal at a predetermined rotational position of the wind turbine blades. One or more of the blades is configured with an aerodynamic modifying device. Noise level is measured with the noise measuring device during wind turbine operation. The noise produced by each of the blades is determined. The blades are configured in response to the noise determined for each of the blades. A method for measuring the noise level generated by an individual blade and a wind turbine configured for desired noise level are also disclosed.