Do u have a wife hehe vgood red
the gearbox has "square" teeth or something like that, thats why it whines...Double check you chain tension (45 to 55mm) Go for 55mm for quietness...and make absolute sure of the wheel alignment.. What mileage ?? Are you running an oem front sprocket or an aftermarket one ?
I think the noise is simply the weight of the chain rubbing on the plastic chain guide!