If you disconnect the Supercharger belt and the noise goes away, then the problem is within the Supercharger. If it sounds like a lot of marbles rolling around inside the Supercharger, then the Supercharger has a problem. You can either purchase a new supercharger, OR; there is a repair kit available on E-bay and elsewhere that replaces the joints inside that are worn out and broken. Last time I checked it sold for about $150-160.

That is the simplest explanation.

Good Luck!
Ralph