

Pan law on Group buses
I have set the pan law of -3db.
When I create a bus group and then I send to another one I "lose" 3db.
For instance I have a drum bus that goes to a "Music bus" with all the other instruments (except for the vocals).
Then the Music bus goes to the Mix Bus.
So with these 2 send I lose 6db.
It means that if I want to hit the plugins on the mix bus at a certain level I can't do it.
Should I "override" the pan law in these buses or would it be a mistake?
Yesterday I uploaded a video track (removing its own audio) and an audio track.
Then I manually synced them in Reaper and it was fine.
But when I export it goes a bit out of sync.
The video is at 50 Fps and I exported at 50 first and then I tried at 30 (as it was the default) but the video is always a bit out of sync.
I tried both MOV and MP4, but still no difference.