MEANWHILE... I found some answers after doing some more digging, and was able to set up something that appears to do what I need.
I ended up setting up a layer to go with each marker, on which I inserted the audio associated with that marker, INSTEAD OF adding the audio tracks directly to each marker on the base layer. With variables and triggers I was able to "enforce" listening to the audio on each layer, and then I set up an overall numeric variable that has to equal a number (the number of markers) before the Next button becomes "normal".
So thank you to those who have dealt with this issue in the past, for sharing ideas and solutions.
Take care
Karen
