Ignore message below. I checked off the "Synchronize soundtrack and slides" and set the offset on each slide to zero, and it seems to be working. Thought I tried that before but obviously not. Sorry for the bother.
Sorry, but it doesn't work for me. I was using the Slide Options to add audio, but that didn't work either. Here's what happens. My first slide is 5.5 seconds long. The second slide has an audio file attached by your method. As I said, I have slides hold until a key is depressed and the next slide appears. If I just let the first slide sit there, after 5.5 seconds the audio from the second slide starts to play.
In previous versions you had to have the project options set a certain way to link audio directly to slides. Nothing I try is working.
CB