Octave (Ottava) lines are used to indicate that a section of music is to be played one or more octaves above or below written pitch. 8va alta/bassa lines are particularly common in piano scores, though they are sometimes used in other instrumental music. 15ma alta (2 octaves above) and 15ma bassa (2 octaves below) are also occasionally used. MuseScore creates playback for ottava. The line may be styled as solid or dotted:
8--------┐or 8va--------┐: Play one octave above written pitch.
8--------┘or 8va--------┘: Play one octave below written pitch.
Ottava lines can be found in the Pitch and Lines Palette. To add one to note(s) or measure, and adjust its time range, see Using the palette and Other lines : Apply line chapters. To fine tune layout position, see Adjusting elements directly.
Properties specific to the selected ottava(s) can be adjusted in the Ottava section of the Properties panel, namely:
Type: Specifies whether the Ottava line is 8va, 8vb etc.
Show number only: Hides any text (such as “va”).
Show line: Makes the line visible / invisible. Text is unaffected.
Allow diagonal: Allow line to slope if required.
For other properties in this tab, see Line properties.
This has a similar user interface to general lines (see Line properties), but uses special code to specify the ottava text.
See the main chapter Templates and styles
Values of the "Style for text inside Ottavas" can be edited in Format→Style→Text Style→Ottavas.