1. Open the Key Signatures, Tonality Systems and Accidentals panel in Write mode.
  2. Select a tonality system by clicking the menu button and choosing one from the list. Dorico ships with two equal temperament tonality systems; one for 12-EDO (which is the default), and one for 24-EDO. It is possible to define your own by pressing the New Tonality System button, after which it will appear in the list.
  3. Input a key signature in the score at the point where you would like the tonality system to take effect from.
  4. The Accidentals panel will update to show the available accidentals for the selected tonality system.
  5. You can add as many tonality system changes to your flow as you like. Simply repeat the process at any point in the flow.