In PE 13, I used Time Remapping to apply slow motion to a short video, just slowing the entire clip down to 1/2 speed.
My sound track remains the same length as the original shorter video however. Is there a way to just apply the audio track from the first half of the video to the second half; in other words, just repeat the audio so the total length matches the new length of the video? (It is a simple pan shot of a waterfall with constant sound.)
You can add the clip again to your timeline, right-click on it and select Delete Video. That will give you the audio only and you can place it wherever you'd like.