Want to disable or hide the player navigation buttons in a Storyline course until learners have finished interacting with a slide? Just add a trigger to change the state of the previous, next, or submit button. Choose from normal, disabled, and hidden states. See these user guides to learn more about triggers: Storyline 360, Storyline 3, Storyline 2.
For example, let's say you want to disable the next button until the slide audio has finished playing. You'd add two triggers: one to disable the button when the slide starts and another to enable the button when the audio ends.