99 Altima Front end Rumble

99 Altima GXE Mileage: 57000 Need help troubleshooting a front end rumble noise that seems to be getting a louder. While driving straight, there seems to be a Rrrrr-Rrrrrrr-Rrrrrrr sound that comes from the front end or front tires, the sound increases as the speed increases. While driving the curvy roads make slight right hand turns, the sound disappears. While applying brakes to slow as approaching traffic light, the sound decreases. I have replaced the tires, and have had them balanced and front end alignment.