OOps. I did some more work and the good news is that PTE is working fine. Be careful with your music editing program. If you are ripping tracks from a CD, there is probably dead space at the end of the track. Your editor considers it to be part of the track as does PTE. The result is that the last few slides may not have any audio. The problem I had was that when I cut off the silence, I wasn't saving the new version properly. Probably should read the manual, but that takes all the fun out of the process.