* How to Remove All Speaker Notes in a ppt [[http://www.avantixlearning.ca/microsoft-powerpoint/quickly-remove-speaker-notes-powerpoint-presentation-training/ | Ref]]
    - Open the Powerpoint presentation with the notes you wish to remove.
    - Save a copy of the presentation so you can keep the original with the notes.
    - In the copy, click the File tab in the Ribbon.
    - Click Info and click the Check for Issues button. A drop-down menu appears.
    - Select Inspect Document. A dialog box appears.
    - Ensure that Presentation Notes is checked (you may need to scroll down in the dialog box) and then click Inspect. If there are speaker notes in the file, a Remove All button will appear indicating that notes have been found.
    - Click Remove All beside Presentation Notes to remove all notes. Note that this cannot be undone.
    - Click Close.

  * How to adjust playback rate for inserted video
    * https://videoconverter.wondershare.com/video-editing-tips/speed-up-video-powerpoint.html