Different player features for different slides

Hi.  

How do I have different player features showing for different slides. One of my SL slides has a video in it - and I would like a seek bar on that slide only.

And, about 1/3 of the slides have audio and I would like the 'speaker' feature to show up on those slides.

I can see how to add an individual seek bar to a video slide, but how do I add just the volume to the player for the slides that have just an audio track on top of the other base layers?

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