Adding or changing the abbreviated name:
To make staves more easily identifiable in the score, you can give each track
an abbreviated name. This displays to the left of every staff (if you check
the Show Abbreviation box). Add or change an abbreviation by doing the following:
Click the Abbr.field.
Type in the abbreviated name of the track. If you check the Show Abbreviation
box, the abbreviated name appears to the left of all staves after the first
staff.