Yes, I save as midi file. When I add audio (guitar vocals etc) I save as a seq file. I know the seq files won't even open. The midi songs open but all the tracks in the song volume is 100%.
There must be something like "PowerTracks event list" in Studio One somewhere. I did find a window somewhere with a slider that controlled the volume but, I did not see how to save it.
I only got the Studio One because I can't open or find many plugins in PowerTracks.