Any ideas about how dr dre got eminems vocals to sound how they do?

Does anybody actually know exactly what techniques doctor dre used to record and mix eminem's vocals on albums like the eminem show? To me it sounds like he recorded maybe four takes of the same verse, and then blended them in and out as spot stacks to add emphasis where he wanted, with slight pitch changes to use the hass effect to create some space, and panned them l,r,and center