Wierd timming.. fla to swf

hello ive just made a move… 1900 frames :worried: 3 layers…
1 where all my images go… 50 images each on in frames,
2 layer some squares nothing much
3 layer 1 minute loop.wav

now when i hit shift +enter the transition run’s great… because the images appear deppending the sounds…

but when i export it to swf ctrl +enter the timming i had on my flash is not the same as the swf… plus the sound quality decreases

soo mm whats the deal.? any ideas to solve the problem???
if the file wasn’t so big i would upload it but is huge… so if u have any questions just post them.

simple 3 layer movie…
50 image sequence… 50 fps…
thanks alot.