When I insert an instance of gpo in sonar three it doesnt list whether its DXI or VST even after using the adapter. I admit I have been using the Dxi version for a long while. But when I go to look for the VST instead, I cannot find it and I have double checked twice with the VST adapter and it says its activated. In Sonar 2, though I didnt use the VST version, it listed the two seperatly.
Secondly, I found an odd thing with the tempo change bug and sonar in general. It appears sonar "likes" the tempo changes to be insterted , if your looking at the tempo page, directly on the bar lines. I cant confirm this since I have tried to do it every beat and every bar and sometimes had to insert re insert it just at a slightly different tempo, but it seems over all to work.
So if your trying for a accelerando ect try placing each change on the beats in straight lines so it looks like steps . Most likely you will have more success in the tempo instead of the gradual draw. Though its kinda a cheap work around and I would rather have tempo changes fixed hehe I found this to be easiest as well to keep your song out of a perfect tempo. Like I said before I cannot confirm this since I only have my computer to test this on. For me sonar seems to like these things happening on bar beats.
Now if I could just have some clue as to how to tell whether your using VST or DXI in sonar three that would be helpfull.