Just now I found the official instructions. I share it here.


https://www.pgmusic.com/techfaq51.htm#62


62. How do I change keys in the middle of my Band-in-a-Box® song? Can I display more than one key signature?
To transpose to a new key in the middle of a song, you can use the Edit | TransposeFrom...to Dialog. To display the new key signature in the notation window, you can use the Settings for Current Bar dialog (press F5 at any bar).

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