issues with text to speech on replay (Storyline 360)

I don't believe that there is any way to link triggers to seekbar controls and that is the reason why I attached the Stop Audio trigger to Icon 4, as this has to be pressed to hear the audio. If the user clicks the Replay button and then clicks the Play button on the seekbar, I don't think there is much you can do to get the audio playing.

Your other option is to stop the audio when the timeline starts for the slide. This will effectively reset it when the Replay button is clicked, however you still need to click on Icon 4 to play the audio, unless you also start the audio when the timeline starts, but that then defeats the object of your current setup where I assume you are putting everything on pause until the user is ready to start by clicking on Icon 4.

Personally, unless there is a reason why you specifically want it available, I would disable the seekbar.