Wow, yeah, mine wasn't that bad. I could only slightly hear mine if I crouched down by the passenger side tire. Mine only made sort of a shoosh shoosh shoosh that I attributed to the new permenant magnet sensor. Mine went away within a day or so.
If I were you, I'd have to pull that baby apart and see whats hitting. It almost sounds like the balancer is coming apart. Remove both your belts and see if the sound changes.