Audio in logic pro

Hello there. I m having several issues. I have the latest version of logic pro in a mac. 1. When I have scaler in an instrument on a track and then I use another instrument my scaler disappears from the 1st instrument. 2. When I am trying to un-sync DAW then it looks like my MAC´s keyboard controls the DAW and not the scaler. 3. If I make a pause and I go to another app (for ex safari) and then again to scaler the sound disappears. I have to close the scaler and then change instrument and. then open it again for the sound to work. could you help me?