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Here is something I would try what shape is the tires in condition wise? If the sound starts when the wheels are moving but not when the wheels are in the air maybe to problem might be in the tires a broken belt of radials or something like that maybe take tires off front and switch them to back does sound go away or still heard from behind
Have you checked to see if rotors are out of round, maybe something as simple as wheel covers maybe take them off and see if the sound stays or goes maybe something as simple as an object stucking the tread like a rock or something, don't take it the wrong way but I have over looked things as simple as a new set of wheel covers are a little loose and making a sound, if I may ask is there anything that you might think of that may have changed to the vehicle before the noise came, I try to think of things that I might have done or had done in the past that might lead up to it. I am running things through my head of what might be your troubles I will think of anything else that might come to me.