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IIRC with Adobe Flash you add an mp3 to a library, give it class name, then do `static var BGM:Sound=new EmbeddedMP3();`, that’s all. I wonder, does it still take place with FD, or I have to employ loading from a ByteArray.
You can embed it in the swf with the `Embed` metadata tag.
Something like [this guy says](http://www.lpopova.com/2013/01/how-to-embed-sounds-and-music-in.html)
If you have the sound in the lib folder of your FD project, I think you can right-click it and choose ‘Generate Embed Code’