Nat,
Thank you for your reply. That worked perfectly. The narration is on another track. The videos concern voice recognition, so obviously they need to be in sync. Besides text, the dictator is also issuing voice commands that trigger multiple keystrokes for formatting and navigation. The speaker is quiet during the execution of these sequences. I use these pauses for my narrations, which are usually short explanations. The slowdown of the video is really not noticeable.
I appreciate the time that you took to answer my query and the speediness of the reply.
Demogd