Flex Simultaneous MP3's, Audio tracks are off slightly

I am trying to play 5 tracks at once. I'm making a small audio editor using flash builder and flex 4.0.

My problem is that my audio tracks are delayed by a few miliseconds. How can I align them up?

Code:

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instrumentalChannel = sound1.play(0, 0, new SoundTransform(instrumentalOptions));
vocalChannel = sound2.play(0, 0, new SoundTransform(vocalOptions));
supranoChannel = sound3.play(0, 0, new SoundTransform(supranoOptions));
tenorChannel = sound4.play(0, 0, new SoundTransform(tenorOptions));
altoChannel = sound5.play(0, 0, new SoundTransform(altoOptions));

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