When you import sound files, you can identify the sound as either a streamed sound or an event sound.
In a Macromedia® Flash file, streamed sound is played as it arrives on the users machine.
Because Streaming Sound samples are broken into small bits and inserted between the video frame, the Macromedia® Flash player can start playing the sound before receiving the full sound track. This is useful when you have a long sound track such as background music.
The Macromedia® Flash player keeps the streaming sound synchronized with the video by dropping frames if necessary, for example, if the video renderer is too slow and falls behind the sound track.
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