Trigger action at set time or when audio completes?

Is it possible in some way shape or form to trigger an action at a certain time or when some audio completes? This is a built in function in Articulate Storyline so I'm wondering if the Adobe wizards have figured this out.

I'm looking to adjust a variable when the voiceover completes that basically says the slide is complete. I know how to do this with buttons and On Exit but even On Exit doesn't work correctly since the user can exit the slide without finishing the audio.