Custom accidentals can contain traditional accidental glyphs but also other musical symbols, text, and graphics. This allows you to design accidentals that express specific pitch deltas in your custom tonality systems.
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You can find all accidentals available in the current tonality system in the Accidentals section of the Edit Tonality System dialog.
You can create new and edit existing custom accidentals in the Edit Accidental dialog. You can edit accidentals included in the default tonality systems that come with Dorico Pro. New custom tonality systems start with a natural accidental, which you can edit or delete.