As AB said the whine is a direct product of the actual gears in the supercharger.
For example: this is why the old vortech V-1 S trim superchargers whine EXTREMELY loud, while their current replacements the V-2 SQ (super Quiet) S-trim superchargers are MUCH quieter. S-trims were vortechs leading seller as they are used in the entry SC kits to power most F-bodies, mustangs, ect. Many folks did not like the loud whine so vortech spent a lot of time designing a quieter gear for these units. They eventually followed suit with the T-trim headunits offering a Version 2 of them jsut a couple of years ago.
The novi 2K's are quieter units, and I beleive still operate in their own independent oilbath UNLIKE the vortech that uses oil pressurized from the engine to lubricate the bearings.
Many people have had problems putting more than 8K miles on a novi 2K witout a bearing failure due to a leaks around the seals and housings which eventually all of the oil leaked or was sucked out undetected through the the compressor by the engine.
Since Vortech has taken over paxton I am not sure if this problem has been alieviated.
Not very many centrifugal supercharger run off of a cog drive as this setup is an extra expense, but it does insure that there is zero belt slip.
THe ONLY reason for a cog drive on a supercharger is to eliminate belt slippage when spinning the sc to produce higher cfm of air (higher PSI on engine).
