I am trying to change a trumpet stave to a trombone stave. I follow the directions, click change. It shows I have "Trombone" showing but is still in Treble Clef with the notes well below the staff. How do I change the clef to Bass Clef? Note, the trombone instrument is set to Bass Clef in the settings. Smae thing happens if I change to Bass Trombone, I can not get the clef to be Bass Clef there either.