Sound question

I have been using flash mx 2004 for about a year. When I started using it, I would import sound and put it into the timeline, and the sound would play when I moved the bar over the frames with the sound in it, without me pressing play or testing it. However now, the only way for the sound to play is to press play when the bar is before the start of the sound, and then the sound will always play to the end, even if it stops on the timeline. This makes it very hard to coordinate sound and the animation unless the sound file is very short. How do I get it to go back to the way it was?

Set the sound synche to stream in the properties panel.

ooooh ok thanks