For your info on the Garritan Aria Player VST Multi not loading all outputs in Sonar X3 Producer:
I have reported this issue to Garritan product support on Oct 17, and have been working with their customer support person (Jonathon) since then. I quoted to him Noel's response above regarding "audioMasterGetProductString". It seems that Jonathon was not aware of this issue. After providing him with various information and some screen shots showing the other output channels grayed out in the Aria player, yesterday Jonathon said that he will do his best to report this as a bug to the development team.