output of the Bellari VP530

Picked up the above unit and was figuring on hooking up the USB line directly to the imac. But they do not give any instructions except your computer should see the phono amp. OK need software understand that, any good software for this type of set up. And has anyone tried this type of set up. This is sort of a test rig to see how and should I take and transfer all the records to the imac.

Also was wondering they must do a AD conversion here but at what rate? My guess the it is 16/42 anyone really know?
Best inwanw