Hi Dave and welcome to the 123PPT Community!
When you download a YouTube video to use as a video background in your PowerPoint presentation, if the video contained sound then the sound would play constantly as long as the video background itself played. So for example if you downloaded a YouTube movie that you wish to use as a video background on all the slides of your presentation then the audio track of the YouTube movie would be playing constantly throughout your presentation. For many audience members or viewers this would become very irritating as the video background looped.
In the overwhelming majority of cases a presenter is using a video background to add visual enhancement to their PowerPoint presentation and slides and want to use sound to create a playlist of music that they can control in their presentations or sound effects that they can synchronize to gain attention etc.,
If you imported and used a YouTube video as a video background and sound was enabled in the YouTube clip, then it would not be possible for you to control the sound in the clip as the sound plays as the clip plays and if for example you wanted to add additional music or sound effects to your presentation these would have to play over the top of the audio track in the YouTube video.
The http://www.123ppt.com/music-soundfx-studio/download.asp - 123PPT Music & SoundFX Studio allows you to control music and sound in PowerPoint and lets you fade music in and fade music out, crossfade between tracks, control audio volume, create playlists, narrate your PowerPoint presentations and so much more.
Because adding audio to PowerPoint presentations until now has only been possible to start or stop, the 123PPT Music & SoundFX Studio provides you with the tools and functions to be able to control your presentation sound so that it does not irritate audiences but insteads adds another dimension to your PowerPoint presentations and creates impact.
In the 123PPT Music & SoundFX Studio section, we use an http://www.123ppt.com/music-soundfx-studio/ - example to show a normal static PowerPoint presentation . We then transform the presentation with the http://www.123ppt.com/video-backgrounds-studio/ - 123PPT Video Backgrounds Studio and video backgrounds. And then the same presentation made with the 123PPT Video Backgrounds Studio and video backgrounds, together with the 123PPT Music & SoundFX Studio to include sound, audio and effects. To show the impact video and sound can have in your PowerPoint presentations.
To gain real control over video backgrounds and PowerPoint presentation music, audio and sound effects Dave, ideally you should use and combine both applications.
------------- Admin, 123PPT
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