David,
Fx busses output to out 15-16 on my board.
Main Vox outputs to 1-2 on the board
Main track has the sends. Main track Signal goes to main vox so to add compression , EQ, etc.
When l lower the fader on main track, fxs persist.
I do see the signal on those busses
I ended up putting the sends on the main vox track and then it behaves the way is supposed to but l shouldn't have to do that.
Hope this helps as l know is hard sometimes to envision the situation