when you test in the ide everything is ok, but when you publish a swf you see something unexpected?
I read it as the other way around.
I wonder if there is a Stream audio in there, and that at frame 300 the playback is so far behind that it's forced to jump ahead?
There is a stream audio in there! But why would the playback jump ahead because of this?
Actually, it's the other way around: when I publish a .swf, everything is fine, but when I test in the IDE it jumps.
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When you press the enter key to have the play head move along the timeline, it will try to draw things and also keep up, but at the same time it's drawing all of the Flash Pro interface. If your frame 300 is especially demanding to draw in the stage preview, the play head might get to be a long way behind where the sound thinks it should be.
Would be interesting to zoom out until the stage is small, which hopefully would draw quicker. See if that makes it not jump at a certain point.
In general though, scrub the play head while you are working on the sound sync, and control-enter to really see what it's like. Just pressing enter is likely to not perform well enough.
Thank you for your answer; the concept you've described seems to fit my situation. I set the audio files back to "Event/Start" and it plays on the timeline, but it the files keep playing and I have to clip the parts I don't want by adding a custom effect and adjusting the volume.
Is there any way to fix the lagging that occurs when an audio file is on stream? It'd make it much easier!
Also, I tried changing an audio file back to stream and it doesnt jump to the last frame anymore. Rather, it plays and stops right as the audio file's suppose to start. I pause then play at that spot and the timeline only plays one frame before stopping again. This issue with the "Stream" audio is quite an issue.