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Servo motors consume a decent amount of power even when they are standing still. Take a look at the Arduino TomServo Library. It places the servos into a high-z state when they aren't moving which cuts the amount of power they consume down to almost nothing! Multiply that by all of the motors you have and that's quite a lot. It will probably eliminate all of the buzzing sounds unless you engage too many of them at once for your power supply.
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