I am interested to purchase the Garritan Personal Orchestra having already Sibelius 3. Info said GPO is Sibelius 5 "enabled". What about Sib 3? It does what I need so I do not plan to upgrade to Sib 5. I found a couple of info's: James Humberstone; Sib user guide for Sib 3 in GPO. It is of 2005. Also Paul David Bergel: Tutorial getting GPO to work with Sib. Are they still valid? Also I have PT Pro Audio 10. How would this work with GPO? Why is a somewhat complicated procedure necessary between Sib 3 and GPO? Wouldn't Sib create a MIDI file and GPO could load and play it? Also could GPO convert the Sib created MIDI file into a WAV or MP3 file with GPO's superior sound? These questions are for starters, rest comes after I purchase the GPO.