So I was confident enough in AP9 that I uninstalled all other versions of Acid Pro, including AP7. Garritan Aria came bundled with AP7, and when I uninstalled, Aria didn't show up in AP9's VST list. I was a little disappointed, because Aria had some nice orchestral sounds. Just on a whim I tried installing Aria, and when I opened AP9, I was pleasantly surprised to find Aria in the VST list. I fired it up (by dragging it to the track list) and by golly it works great!! :)