Re: How do I make Overture obey Aria's pan settings?
This sounds like what happens in Sonar and other DAW software - The program's MIDI controls take precedence over ARIA's. So, for instance, when I'm setting the relative volumes of faders in ARIA, I use the MIDI track faders in Sonar, because by default they control ARIA's faders. That's CC7 in charge - and it makes sense for the Host program to control that, it's no problem. In Sonar, that default can be over ridden if the user insists on using the ARIA faders. Same for the pans - that's CC10 - The pan pots in Sonar control the pans in ARIA by default.
"...I use ARIA's CC1 to set instrument's placement-volume..." Placement volume - that sounds like you mean the general overall potential volume of an instrument. Like I said in the other post, that should be done with CC7. The dynamic volume control is with CC1, 2 or 11. In a notation program that's set up to work with Garritan properly, that's what dynamic markings need to control.