Deleting Overlay-Mode Enhancements (Windows Only)
To delete an ITV SMPTE-363M enhancement that uses Overlay mode and its associated matte key:
  For information about Overlay mode, see Understanding ITV Modes.
1.  Select one or more enhancements and their associated matte keys.
2.  Press the Delete key.
The Delete dialog box opens.
  The option "Delete n enhancement(s)" is selected, with n indicating the number of enhancements selected.
  The option "Delete n effect clip(s)" is selected, with n indicating the number of objects selected. If you want to delete the associated media, select the suboption "delete n associated media file(s)."
3.  Click OK.
  If you delete an enhancement that has an associated matte key, both the enhancement and the matte key effect are deleted from the bin, but the matte key media remains on the media drive.

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