Suspending Audio

Hi,

I'm very new to Storyline (still using Story line 1). I'm hoping someone can help. I have two issues.

  1. I've created a slide which has three scenario choices - each choice has a different scene the user can view. After each scene is viewed the user will click a button at the bottom which takes them back to the scenario slide to choose another scenario. I have audio on the scenario choice slide but I want it to play only the first time the slide is visited, not each time the user goes back to it to select another scenario. Is there a way have the audio only play one time. 
  2. After the user views a scenario how can I make that scenario gray out? I tried adding a trigger to the object - change state of object to visited when user ...but not sure to select.

Thanks

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