Tuning Pitch

Principle

The tuning pitch sets the base frequency from which the different notes are played.
It allows the different instruments to be tuned in a consistent way so that they "sound" well together.
It is defined by the frequency in Hertz of A4.
Currently, this value is generally 440 Hz, by convention (ISO 16 standard adopted in 1955)

However, in the past, the tuning pitch could have various values, for example around 415 Hz for baroque music, or 430 Hz for classical.

If you transcribe, for example, baroque pieces, you probably want your score to be played at the tuning pitch you have chosen by the people to whom you send it.

Conversely, if you have a baroque instrument tuned with A at 415 Hz, you want all the scores you play and use for practice to use this tuning pitch.

Here is how to do it:

Adjusting the score tuning pitch

When editing a score, you can specify the tuning pitch to use for playback. This setting will be applied when you send the score to someone unless they explicitly decide otherwise.
For example, to set the tuning pitch of a baroque score to 415 Hz, use the menu "Score > Edit global digital effects"
Check "Tuning" and choose a value in tenths of Hz, here 4150 (10 x 415)

Adjusting the application tuning pitch

When the score you are playing has not imposed a tuning pitch, you can choose the one that will be used by default for you. This is done in "Configuration > Digital output configuration", also in tenths of Hz. Generally this value is left at 4400 (A4 at 440 Hz), but you can choose it.

And if in this dialog you check the "Force" box, this value will always be used on your system, even if the author of the score has set a different value in it.