Under Home Screen > Settings > Symphony Pro > Usage Preferences, you'll find an option labeled Show 64th Note (as illustrated below). Turning on the corresponding switch will include a 64th note/rest icon within the Notes Toolbar, but it will only be available from landscape mode.
If you need any clarification on how to access this option, please let us know.
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If you need any clarification on how to access this option, please let us know.