Hi Adam, Your revert doesn't work because it doesn't match the default for 9/8.
If you check the auto-beam engraver settings in auto-beam.scm you'll see the following line: ((end * * 9 8) . ,(ly:make-moment 3 8)) So you need to change your revert to the following: #(revert-auto-beam-setting '(end * * 9 8) 3 8) Regards, Neil
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