Bypass, remove, or rescan third-party Audio Units plug-ins in Logic Pro X

Learn what to do and Logic Pro or MainStage isn't working properly and you're using third-party plug-ins, or you can't find a recently installed plug-in. 

If you're using third-party plug-ins, try any of these recommendations to fix your issue depending on what you're experiencing:

Bypass Audio Units plug-ins

If you're having an issue in a particular Logic Pro project or MainStage concert that uses third-party plug-ins, bypass each third-party plug-in in the project one-by-one, testing the project after you bypass each plug-in.

You can bypass plug-ins several different ways:

  • Place the pointer over the plug-in slot in a channel strip, then click the Bypass button  so the slot dims.
  • Option-click the plug-in slot so the slot dims.
  • In the plug-in window, click the Bypass button  so the slot dims.

If bypassing a plug-in fixes your issue, check with the manufacturer to see if the plug-in is compatible with your version of macOS, and for possible updates.

Remove Audio Units plug-ins

If you can’t open Logic Pro or MainStage, try manually removing plug-ins.

  1. Find the plug-in file on your Mac
  2. If you suspect a particular plug-in, locate the file for the plug-in in the folder, then drag the file to the Desktop.
  3. Try to reopen the app.

If you still can't open Logic Pro or MainStage:

  1. Create a new folder on the Desktop.
  2. Move all the plug-in files that appear in their installation locations to the new folder.
  3. Try to open Logic Pro or MainStage.
  4. If you can open the app, replace each plug-in file to its original location one-by-one. Quit and reopen the app after you replace each plug-in file. If you can't open the app after replacing a particular plug-in file, that plug-in might be corrupted or incompatible. Try reinstalling the disabled plug-in or check with the manufacturer for an update.

Restart your Mac

If your Mac is running macOS High Sierra or later and you recently installed a plug-in that isn't available in Logic Pro or MainStage, restart your Mac. Before you restart your Mac, confirm that the plug-in is 64-bit compatible. 32-bit plug-ins aren't compatible with Logic Pro or MainStage.

  1. Choose Apple menu  > Restart.
  2. Open Logic Pro or MainStage. 
  3. Click an Audio Effect, Instrument, or MIDI Effect slot to see if the plug-in is available in the pop-up menu. If the plug-in still isn't available, rescan the plug-in.

 

Confirm that the plug-in is installed

If a recently-installed plug-in still isn't available after restarting your Mac, confirm that the plug-in is installed:

  1. Choose Logic Pro X > Preferences > Plug-in Manager, or MainStage 3 > Preferences > Plug-in Manager.
  2. In the Plug-in Manager, locate the plug-in. To filter the list by manufacturer, click the manufacturer's name in the left column. 
  3. If the plug-in doesn't appear in the Plug-In Manager, find the plug-in file.
    If "not authorized" appears in the Compatibility column for the plug-in, make sure the plug-in is properly authorized as documented by the manufacturer.
  4. Reinstall the plug-in, then restart the computer.
  5. If the plug-in still isn't available, check with the manufacturer to see if the plug-in is compatible with your version of macOS, and for possible updates.

 

Rescan a plug-in

If the recently-installed plug-in is installed, use the Plug-in Manager to rescan the plug-in.

  1. Choose Logic Pro X > Preferences > Plug-In Manager, or MainStage 3 > Preferences > Plug-In Manager. 
  2. In the plug-in Manager, locate the plug-in you want to check. To filter by manufacturer, click manufacturer's name in the left column.
  3. If "failed validation" appears in the Compatibility column for the plug-in, select the plug-in in the list, then click Reset & Rescan Selection.
    If "not authorized" appears in the Compatibility column for the plug-in, make sure the plug-in is properly authorized as documented by the manufacturer. Then rescan the plug-in.
  4. If the plug-in fails validation again, check with the manufacturer to see if the plug-in is compatible with your version of macOS, and for possible updates.

Rescan all plug-ins

To automatically rescan all installed plug-ins, remove the Audio Unit cache file.

  1. In the Finder, press Option and choose Go > Library.
  2. In the Finder window, go to Library/Caches/AudioUnitCache.
  3. Move the files from AudioUnitCache folder to the Desktop. 
  4. Restart the computer, then open Logic Pro X or MainStage. All installed Audio Units plug-ins will be rescanned.

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