I have both Studio One 2 Producer and Studio One 3 Artist with the VST pack. When I open a song made in SO2 that I used a compressor with, the volume in SO3 was low. After I looked into it, the compressor Auto Gain behaves differently between the two.
Here is what it looks like in SO2:
and SO3:
You can see the difference in the curves...why does it do this?