When this option is activated in the Staff Options dialog, there is only one line in the system. Furthermore, notes can only appear below the line, on the line and above the line.
To decide which notes go where, proceed as follows:
1. Open Staff Settings and click the Staff Options button.
2. Activate Score Drum Map and Single Line Drum Staff.
3. Set up the two pitch values to decide which pitches go on the line.
Notes below this range automatically wind up below the line and notes above wind up above the line.