Mute background audio on slide/start audio AFTER specific slides/CHANGE audio on different scenes?

Hi jveedubs​. Background Audio is a great feature, but it does behave differently to any audio or video on your slides, and some of the issues you describe are due to these differences.

When you add Background Audio to a project, it will be one of  the first assets to load when your course is opened, and this means it will likely start to play before your visual assets have loaded. This is why you're hearing it for a moment before your (larger) video loads. You could try a trigger to, 'Stop Media [Background Audio] when timeline starts on this slide'.

However, the chances are the Background Audio will still load before this trigger can stop it, so you'll still hear it play just before the video starts.

Personally, I'd recommend adding 1-2 seconds of silence at the start of your audio instead. You can do this very easily in Audacity or similar.

But once the course has opened, a Stop Media or Pause Media trigger is a reliable way to control the Background Audio. In your example, you could add a trigger at the start of the first slide in Scene 4 to stop or pause the Background Audio, and then trigger another audio track to play on that slide. But bear in mind, this new track will only play during that slide, not across Scene 4. 

Here's another trick that might help: use tiggers to gradually reduce the Player.BackgroundAudioVolume from 100 to 0, to achieve a more subtle 'fade out' effect at a certain point in your course. You could then trigger a different audio to start once the Player.BackgroundAudioVolume reaches 0.  Again, this new audio would be housed in a slide and would not play across a scene.

It's not currently possible to trigger the 'next song' in a playlist, but it's a feature request that many have suggested. I'd like to think this time next year it'll be a standard feature. But, for now, I hope this helps.