Mist some water on the belt while the engine is running, if the noise goes away you have a belt problem. If no change in noise something else is the issue.

If there was no change in noise, remove the belt and start engine. If noise is gone, you have an accessory has a problem. If noise still there, you have an engine problem.

If water in step one made the noise go away, sand the flat pulleys with 80 grit working in a X fashion. Also look at the belt for a number sticker, if hard and slippery, lightly sand this area. What happens is the belt slides across the flat pulley making a squeek noise.

While the belt is off the accessories and feel for roughness. Also spin the clutch on the super charger, I think there is a coupler in the front nose that fails. Note, the super charger runs when the engine is cold to provide air to the cat converter so you could have a super charger noise at idle.