Whole Note Command
This command selects a whole note duration for use during note entry. If it is selected when a note, chord member, or rest is added, the resulting item on the staff will have a base duration equivalent to a whole note.
For audible notes and chord members, this duration is the equivalent of four quarter notes. For rests, the duration can vary depending on whether the rest appears by itself in a measure. If a whole rest stands alone in a measure, the duration is based on the current time signature.