Hi John,
> I've got a guitar leadsheet that displays the guitar chord G# as Ab.
That’s definitely weird… On my machine, this displays G# as G# and Ab as Ab:
\version "2.25.11"
\language "english"
gsharp = \chordmode { gs1 }
aflat = \chordmode { af1 }
<<
\new ChordNames { \gsharp }
\gsharp
>>
<<
\new ChordNames { \aflat }
\aflat
>>
Maybe post a MWE, so people can more easily diagnose the issue.
Cheers,
Kieren.
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