Greetings, I have a thread going in the Beaugnier section about this old Vito low A baritone that I just got. I started putting it back together today and it plays nice and sounds great up to G. Then A and B are quite flat. Then C is back to being in tune. Any ideas? I've got the upper stack venting pretty wide open and the octave keys are venting plenty. I've only got 2 bari mouthpieces and one [my Otto Link] really needs work because it came from the factory in sad shape. The problem seems the same with both pieces. What do you guys think? Thanks.