Dylan,
Just to be clear, you have all 30 bundled sound packs installed with your Studio One 3 Pro? If so, you should see all sorts of effects, loops, and stock Plugins within your copy of Studio One 3 Professional. You can also check your Studio One Sound Sets folder on your Mac to make sure that they are installed in the correct place and that Studio One is seeing them.
If you need further assistance, you might want to submit a support request.