Problem Syncing sound with flash

I am having a problem syncing sound with my flash program. For one reason or another when I add sound to my timeline it does not play when its supposed to. I set the sync to stream but flash does not drop frames to keep up with the audio like its supposed to. I’ve even used actionscript to accomplish but the same problem exists. I think it may be related to my animation, using somewhat intense graphic manipulations.

Maybe slowing down flash is the answer? I really don’t know at this point… Help! Any help would be much appreciated…