Place a slab of maple or mdf (3"thick) on top of the granite. With that combo which I virtually have with my VPI (I have wood on marble), I can tap away to my heart's content and hear nothing.
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I purchased a VPI mdf/oak base measured specifically for the hrx. It appears at Acoustic Sounds for $700 as the top plate of the VPI equipment rack. Way too much. (Got mine for About $200 as accommodation for buying HRX) I recommend going to lumber yard with dimensions 1" wider and 1" deeper than your table. Have them cut out from the block an area that will house the feet of the motor and set this out just a touch when placing the table on the block so that the vibrations from the motor don't get into the main block.