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Remove Duplicate Notes in Reaper

 Yes, REAPER provides several actions and settings specifically designed to handle and remove overlapping MIDI notes. Depending on whether you want to prevent them while drawing or clean them up afterward, you can use the following methods:

1. The "Remove Duplicate Notes" Action

The most direct way to clean up notes drawn exactly on top of each other is through the MIDI Editor Action List:

  • Open the Action List within the MIDI Editor (Actions > Show action list...).
  • Search for and run the action: "Remove duplicate notes".
  • There is also a broader action called "Remove all duplicate events" if you want to clear other overlapping data like CC messages at the same time.

2. Automatic Correction Toggle

You can enable a setting that automatically manages overlaps as you work:

  • In the MIDI Editor, go to the Options menu.
  • Select "Automatically correct overlapping notes".
  • When this toggle is active, REAPER will attempt to prevent or fix overlaps immediately as they occur during editing.

3. Using the Quantize Dialog

If you are already quantizing your MIDI, you can fix overlaps as part of that process:

  • Open the Quantize Events dialog (Edit > Quantize or press Q).
  • Check the box labeled "Fix overlaps" at the bottom left of the window.
  • Click OK or Commit to apply the fix to your selected notes.

4. Real-time Filtering

If you want to prevent overlapping notes from triggering your instrument without necessarily deleting them from the editor, you can use a specialized plugin:

  • Insert the "JS: MIDI Duplicate Note Filter" into your track's FX chain.
  • This utility is designed to block duplicate notes from the MIDI stream in real-time.

5. Corrective Editing Actions

The MIDI Editor also includes specific actions to help manually "clean" notes that are too close together:

  • "Set note ends to start of next note (legato)": This adjusts the end points of selected notes so they touch the start of the next note without overlapping.
  • "Trim left/right edge of notes to edit cursor": This allows you to quickly cut the overlapping portion of a note by placing your cursor and running the action.

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