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First, start by creating a new movie symbol {Insert >
New Symbol} and calling it "soundtrack".
We will construct our audio layers in this separate movie,
which will give us the ability to target it whenever we want,
and keep the main timeline uncluttered.
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Open the library {Window > Library} and double
click on the movie symbol you just created. This will bring up a
new timeline for this movie symbol. Add as many layers as you have
instruments, naming them to correspond to each instrument (ie. Drums,
bass, rhythm guitar, etc.). Flash will allow between 4 and 8 simultaneous
sound layers, depending on your sound card.
If you have not yet imported your audio files, do
so now {File > import}. If there is not already a keyframe on
frame one, add one from the insert menu {Insert > Keyframe}.
In the timeline, double click on the keyframe you just added, or
highlight the keyframe to open the Frame Properties dialogue box
{Modify > Frame}. Click on the sound tab. Your imported audio
files should all appear from the pull down menu. Select your drum
track. Set the sync method to "Event" and enter a loop value of
16 (this can be changed later).

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