1. Open Logic
  2. Create a new empty project
  3. Create a Software Instrument track
  4. Near the bottom left you'll see a blue button that says "E-Piano". Hover over it and click the up/down button on the right side
  5. Go down to AU Instruments -> Audible Genius -> Primer -> Stereo

Primer will load, and you can program, play, and record it in Logic Pro.