Key signatures are applied to the score from the "Key signatures" palette.
The initial key signature is set from page 2 of the New Score dialog.
Use one of the following methods:
Note: It is also possible, though uncommon, to add a key-signature mid measure by selecting a note then clicking a palette key signature, or dragging the key signature to a note.
If you wish to add a key signature to only one staff, leaving others unchanged, apply one of the following methods:
If you wish to select a key signature for a single staff only, press and hold Ctrl (Mac: Cmd), then click on the key signature.
Use any of the following methods:
To replace the key signature on a single staff only, press and hold Ctrl (Mac: Cmd) before carrying out the above operations.
To show key signatures only at the beginning of a score, and at a key change:
To hide/show all courtesy key signatures (at the end of systems):
To hide/show a particular courtesy key signature:
Care needs to be taken when working in written pitch and applying a key signature directly to a transposing instrument. For example, a Bb clarinet is written a tone higher than it sounds; so, to get the clarinet to display in G major, you need to apply a key signature of F major from the palette. And so on.
Some instruments (e.g. French horn) are conventionally written with no key signature. To achieve this, you need to add an open/atonal local key signature to the staff (this is already done in scores created from templates).
An open/atonal key signature looks similar to a 'C major/A minor' key signature. However, unlike standard key signatures, an open key signature always remains the same, regardless of key changes to the rest of the score.
To create a custom signature:
Drag accidentals onto the staff image as required. Note: Accidentals are horizontally aligned by default. If you want to an accidental in a custom position, hold Ctrl (Mac: Cmd) while dragging it.
To remove an accidental select it and press Del. Note: The Clear button deletes all added accidentals.
Note: Custom key signatures are adapted to transposing instruments automatically. If You want transposing instrument to use custom key signature exactly the same, as it is in palette, You need to transpose it back. Select measure where key signature is placed and use Tools→Transpose.
You can edit properties specific to key signatures in the Key signature section of the Properties panel:
Show courtesy key signature on previous system: See Controlling the visibility of key signatures (above).
Mode: You can select a mode for the key signature if required—major, minor, dorian etc. The default is "unknown".
Various style properties affect key signature display.
Create key signature for all systems
Create courtesy signatures
The use of these properties is discussed in Controlling the visibility of key signatures (above).
Here you can change the way accidentals are displayed in key signature changes in the score.
Clef to key signature
Key signature to time signature
Barline to key signature
Key signature to barline
Key signature to first note
These properties control the various distances before and after key signatures in the score.