MIDI : Score Editor : Mirrored MIDI Editing

Mirrored MIDI Editing
Mirrored MIDI Editing lets you edit MIDI clips and have your edits apply to every copy of the same MIDI clip. This can be particularly useful when editing looped MIDI clips.
In Mirrored MIDI Editing mode, the Mirrored MIDI Editing button flashes Red once as an edit is made to alert you that your edit is being applied to more than one clip.
To enable Mirrored MIDI Editing, do one of the following:
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Select Options > Mirror MIDI Editing.
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Select the Mirrored MIDI Editing button in the Edit window, MIDI Editor window, or Score Editor window.
 
To disable Mirrored MIDI Editing, do one of the following:
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Deselect Options > Mirror MIDI Editing.
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Disable the Mirrored MIDI Editing button in the Edit window, MIDI Editor window, or Score Editor window.
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If Mirrored MIDI Editing mode is disabled, and you edit notes of looped clips in Notes view, the edit flattens the loop. Similarly, editing clip groups separates the clip groups.