1. PE13 does not have a sophisticated slow/fast motion feature.
2. Rendering the timeline only means it makes preview files to make smooth playback.
3. If you want to use slomo (with footage with high framerate intended for that purpose) in PE13 you interpret the clip to the framerate of the timeline then drop it in the timeline (e.g. 120 fps to 60 or 30 fps.) Interpret footage right click on clip in Project Assets and set Assume this Frame Rate ...
Thanks very much Ann, that helps...appreciate your answer.
Very disappointed however that professional software can be out done in any area by a basic free software. I guess now I'll have to figure out how to move a slowmo clip from GoPro Studio into PE13.
This seems like such a popular thing to do in so many videos. Many vehicle tv commercials will show a tire blasting thru a water/mud puddle, etc, and slow that clip down dramatically for a second to show a very smooth splash. You see this done so many times in so many applications. Is there another technic to do this, that I haven't discovered yet?
I would not consider Elements professional software and one cannot in anyway compare it to Gopro Studio.
Once the clip is slowed down in GPS it is saved as a Cineform avi or mov which you can import into PE13.