Questions about PowerPoint audio features

Some questions on using sound in PowerPoint..
(1) - if I want a piece of music to play in the background - do I have to put that on the first slide - I've tried it on the third slide and it won't play on slides one and two?
(2) What's the difference between "Play across slides" and "play in background"

(3) What's the difference between "loop until stopped" and "Rewind afer playing" and when would I use either/both
(4) why would I use a bookmark?
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agwalshAsked:
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Echo_SCommented:
1. Yes, you need to put it on the first slide.

2. Play in Background sets the audio clip to start automatically. It also ticks the "play across slides" box so the audio plays throughout all the slides and "loop until stopped" so the sound will keep playing even if the audio clip isn't as long as the presentation itself.

Ticking the Play Across Slides box does only that -- it doesn't change the sound's start setting from "on click" to "automatically" and it doesn't set the loop until stopped setting.

3. Looping automatically makes the music/audio track start over when it's done. (Basically, the track repeats.) Rewind is used if you don't want the music to start playing again automatically the way it will if you tick "loop until stopped."

4. Bookmarks can be used in a few different ways. One is if you are manually advancing the audio (or video) -- they're an easy way to note where to click for the audio you want. More frequently they're used to automatically trigger animations using Trigger to Bookmark. Basically you add a bookmark on the sound track where you want an animation to occur, and then you animate an object and set it to start at "trigger to bookmark."  When that point in the audio/video plays, the animation plays as well.

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agwalshAuthor Commented:
Really useful clear explanations here on some of PowerPoint's audio features - particularly on the Bookmark feature....thank you!
Echo_SCommented:
You're welcome. Glad to help.
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