Audio Events

Good morning! I downloaded a trial version of the Lectora Professional Suite to see if its Audio Editor could help me with a problem I have. Ideally, what I'd like to be able to do is use an audio controller that allows students to go back and forth within an audio file, and when they do this, have text/graphics appear and disappear as indicated by markers in the audio file. For example, if a graphic appears 10 seconds after the page was first displayed and the audio had reached the 15 second marker, dragging the controller back to the 5 second mark would make the graphic disappear and then reappear 5 seconds later. Using the Audio Editor, I can make the graphics appear when triggered by the event markers, but using the example above, if I drag the audio controller back to the beginning of the audio file, the graphic that appeared on the screen at the 10 second mark is still displayed on the screen. I hope I've made the situation clear; any thoughts? Steve Sheridan