Thank you, Gdball. You are quite right there are a few standard expected setups for a symphony orchestra, and it is a useful shortcut for Dorico users to have them pre-panned like this. There are also many alternate stage arrangements I’ve taken part in either in concert and recordings, like double orchestras side-by-side for Bartok’s Music for Strings, Percussion, and Celeste. It seems this would be impossible to accomplish with the samples as they are now.
My disappointment with this discovery is that there seems to be no way for me as the end user to have full control over the placement of the instruments through either the mixer or the controls in Halion. If I want the violas on the far left of the stage (100left, a standard choice in orchestral pieces with no violins) I can only move them over one-half of the stage length from where the default has placed them (50Right plus 100Left = 50Left). Also I just want to mention these are all solo instruments I am using, so it would make more sense to have complete control over where I can place them.
I submit it would be much better if in a future update the default panning was accomplished with one of the user-accessible controls so we could change them as we need.