# Global Cent tuning

``

    set_cent_tuning!  cent_shift (number)

Globally tune Sonic Pi to play with another external instrument.

Uniformly tunes your music by shifting all notes played by the specified number of cents. To shift up by a cent use a cent tuning of 1. To shift down use negative numbers. One semitone consists of 100 cents.

See `use_cent_tuning` for setting the cent tuning value locally for a specific thread or `live_loop`. This is a global value and will shift the tuning for all notes. It will also persist for the entire session.

Important note: the cent tuning set by `set_cent_tuning!` is independent of any thread-local cent tuning values set by `use_cent_tuning` or `with_cent_tuning`.

Introduced in v2.10

## Example

# Example 1
``
    play 50
    set_cent_tuning! 1
    play 50
| ``
    # Plays note 50

    # Plays note 50.01