Alan, I just tested some styles, and they all work fine. But I discovered some strange things. For example, for the MIDI style grace.sty, piano track is correct, I mean we do get Xmaj7b5 chords, but for the guitar track play a Xmaj7 chord.
Have you some names of styles that don't work ? Did you do a 'Retun to Factory settings', it often solves many looking bugged situations.


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