Nashville Number System not working for chords outside of the 7 scale tones

When I tried rendering charts containing unconventional chords that are outside of the natural 7-note diatonic scale, the root numbers do not appear.
For example, an Ab in the key of C would not be rendered as a b6 - it would just not appear.

WorshipTools Charts only supports chords within the natural 7-note diatonic scale. That’s why chords outside the scale (like Ab in the key of C) don’t show root numbers—they simply aren’t recognized by the system.
What you can do:
- Enter the chord manually (e.g., “Ab”) so it displays as text.
- Use ChordPro® formatting, which lets you specify non-diatonic chords directly so they appear correctly in Charts.
In short: Root numbers won’t generate for chords outside the diatonic scale, but you can still display them by manually entering or formatting with ChordPro®.

Hi Tony,

Thanks for your reply.

What do you mean by using ChordPro® formatting?
I tried writing in chords outside of the diatonic scale in the WorshipTools ChordPro® editor, but they do not appear. As you mentioned, it seems WorshipTools charts only supports chords within the natural 7-note diatonic scale. Is there perhaps a workaround as you are describing by using ChordPro® formatting?

ChordPro® formatting in WorshipTools means you can import or edit songs using the ChordPro® text structure, where chords are placed in brackets within lyrics (for example: [C]Amazing grace). WorshipTools Charts supports standard chord notation, but some chords—especially those outside the natural diatonic scale—may not display correctly.

The best way to ensure chords appear is to use proper ChordPro® syntax and import a correctly formatted ChordPro® file. At this time, there isn’t a workaround for unsupported chords beyond following the ChordPro® format.